21720240

素因数分解:

$2^4\times 3^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{311}}^1$

素因数の和:427

約数の個数: 120

約数和(自身を含む): 73932768

約数和(自身を除く): 52212528

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 97, 120, 144, 180, 194, 240, 291, 311, 360, 388, 485, 582, 622, 720, 776, 873, 933, 970, 1164, 1244, 1455, 1552, 1555, 1746, 1866, 1940, 2328, 2488, 2799, 2910, 3110, 3492, 3732, 3880, 4365, 4656, 4665, 4976, 5598, 5820, 6220, 6984, 7464, 7760, 8730, 9330, 11196, 11640, 12440, 13968, 13995, 14928, 17460, 18660, 22392, 23280, 24880, 27990, 30167, 34920, 37320, 44784, 55980, 60334, 69840, 74640, 90501, 111960, 120668, 150835, 181002, 223920, 241336, 271503, 301670, 362004, 452505, 482672, 543006, 603340, 724008, 905010, 1086012, 1206680, 1357515, 1448016, 1810020, 2172024, 2413360, 2715030, 3620040, 4344048, 5430060, 7240080, 10860120, 21720240]

約数ペア:

[(1, 21720240), (2, 10860120), (3, 7240080), (4, 5430060), (5, 4344048), (6, 3620040), (8, 2715030), (9, 2413360), (10, 2172024), (12, 1810020), (15, 1448016), (16, 1357515), (18, 1206680), (20, 1086012), (24, 905010), (30, 724008), (36, 603340), (40, 543006), (45, 482672), (48, 452505), (60, 362004), (72, 301670), (80, 271503), (90, 241336), (97, 223920), (120, 181002), (144, 150835), (180, 120668), (194, 111960), (240, 90501), (291, 74640), (311, 69840), (360, 60334), (388, 55980), (485, 44784), (582, 37320), (622, 34920), (720, 30167), (776, 27990), (873, 24880), (933, 23280), (970, 22392), (1164, 18660), (1244, 17460), (1455, 14928), (1552, 13995), (1555, 13968), (1746, 12440), (1866, 11640), (1940, 11196), (2328, 9330), (2488, 8730), (2799, 7760), (2910, 7464), (3110, 6984), (3492, 6220), (3732, 5820), (3880, 5598), (4365, 4976), (4656, 4665)]