18915975

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{223}}^1$

素因数の和:281

約数の個数: 72

約数和(自身を含む): 37914240

約数和(自身を除く): 18998265

約数列:

[1, 3, 5, 9, 13, 15, 25, 29, 39, 45, 65, 75, 87, 117, 145, 195, 223, 225, 261, 325, 377, 435, 585, 669, 725, 975, 1115, 1131, 1305, 1885, 2007, 2175, 2899, 2925, 3345, 3393, 5575, 5655, 6467, 6525, 8697, 9425, 10035, 14495, 16725, 16965, 19401, 26091, 28275, 32335, 43485, 50175, 58203, 72475, 84071, 84825, 97005, 130455, 161675, 217425, 252213, 291015, 420355, 485025, 652275, 756639, 1261065, 1455075, 2101775, 3783195, 6305325, 18915975]

約数ペア:

[(1, 18915975), (3, 6305325), (5, 3783195), (9, 2101775), (13, 1455075), (15, 1261065), (25, 756639), (29, 652275), (39, 485025), (45, 420355), (65, 291015), (75, 252213), (87, 217425), (117, 161675), (145, 130455), (195, 97005), (223, 84825), (225, 84071), (261, 72475), (325, 58203), (377, 50175), (435, 43485), (585, 32335), (669, 28275), (725, 26091), (975, 19401), (1115, 16965), (1131, 16725), (1305, 14495), (1885, 10035), (2007, 9425), (2175, 8697), (2899, 6525), (2925, 6467), (3345, 5655), (3393, 5575)]