20994540

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{193}}^1$

素因数の和:256

約数の個数: 144

約数和(自身を含む): 70594272

約数和(自身を除く): 49599732

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 37, 42, 49, 60, 70, 74, 84, 98, 105, 111, 140, 147, 148, 185, 193, 196, 210, 222, 245, 259, 294, 370, 386, 420, 444, 490, 518, 555, 579, 588, 735, 740, 772, 777, 965, 980, 1036, 1110, 1158, 1295, 1351, 1470, 1554, 1813, 1930, 2220, 2316, 2590, 2702, 2895, 2940, 3108, 3626, 3860, 3885, 4053, 5180, 5404, 5439, 5790, 6755, 7141, 7252, 7770, 8106, 9065, 9457, 10878, 11580, 13510, 14282, 15540, 16212, 18130, 18914, 20265, 21423, 21756, 27020, 27195, 28371, 28564, 35705, 36260, 37828, 40530, 42846, 47285, 49987, 54390, 56742, 71410, 81060, 85692, 94570, 99974, 107115, 108780, 113484, 141855, 142820, 149961, 189140, 199948, 214230, 249935, 283710, 299922, 349909, 428460, 499870, 567420, 599844, 699818, 749805, 999740, 1049727, 1399636, 1499610, 1749545, 2099454, 2999220, 3499090, 4198908, 5248635, 6998180, 10497270, 20994540]

約数ペア:

[(1, 20994540), (2, 10497270), (3, 6998180), (4, 5248635), (5, 4198908), (6, 3499090), (7, 2999220), (10, 2099454), (12, 1749545), (14, 1499610), (15, 1399636), (20, 1049727), (21, 999740), (28, 749805), (30, 699818), (35, 599844), (37, 567420), (42, 499870), (49, 428460), (60, 349909), (70, 299922), (74, 283710), (84, 249935), (98, 214230), (105, 199948), (111, 189140), (140, 149961), (147, 142820), (148, 141855), (185, 113484), (193, 108780), (196, 107115), (210, 99974), (222, 94570), (245, 85692), (259, 81060), (294, 71410), (370, 56742), (386, 54390), (420, 49987), (444, 47285), (490, 42846), (518, 40530), (555, 37828), (579, 36260), (588, 35705), (735, 28564), (740, 28371), (772, 27195), (777, 27020), (965, 21756), (980, 21423), (1036, 20265), (1110, 18914), (1158, 18130), (1295, 16212), (1351, 15540), (1470, 14282), (1554, 13510), (1813, 11580), (1930, 10878), (2220, 9457), (2316, 9065), (2590, 8106), (2702, 7770), (2895, 7252), (2940, 7141), (3108, 6755), (3626, 5790), (3860, 5439), (3885, 5404), (4053, 5180)]