21507380

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{61}}^2$

素因数の和:165

約数の個数: 54

約数和(自身を含む): 48778002

約数和(自身を除く): 27270622

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 61, 68, 85, 122, 170, 244, 289, 305, 340, 578, 610, 1037, 1156, 1220, 1445, 2074, 2890, 3721, 4148, 5185, 5780, 7442, 10370, 14884, 17629, 18605, 20740, 35258, 37210, 63257, 70516, 74420, 88145, 126514, 176290, 253028, 316285, 352580, 632570, 1075369, 1265140, 2150738, 4301476, 5376845, 10753690, 21507380]

約数ペア:

[(1, 21507380), (2, 10753690), (4, 5376845), (5, 4301476), (10, 2150738), (17, 1265140), (20, 1075369), (34, 632570), (61, 352580), (68, 316285), (85, 253028), (122, 176290), (170, 126514), (244, 88145), (289, 74420), (305, 70516), (340, 63257), (578, 37210), (610, 35258), (1037, 20740), (1156, 18605), (1220, 17629), (1445, 14884), (2074, 10370), (2890, 7442), (3721, 5780), (4148, 5185)]