20928700

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{947}}^1$

素因数の和:991

約数の個数: 72

約数和(自身を含む): 51840432

約数和(自身を除く): 30911732

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 25, 26, 34, 50, 52, 65, 68, 85, 100, 130, 170, 221, 260, 325, 340, 425, 442, 650, 850, 884, 947, 1105, 1300, 1700, 1894, 2210, 3788, 4420, 4735, 5525, 9470, 11050, 12311, 16099, 18940, 22100, 23675, 24622, 32198, 47350, 49244, 61555, 64396, 80495, 94700, 123110, 160990, 209287, 246220, 307775, 321980, 402475, 418574, 615550, 804950, 837148, 1046435, 1231100, 1609900, 2092870, 4185740, 5232175, 10464350, 20928700]

約数ペア:

[(1, 20928700), (2, 10464350), (4, 5232175), (5, 4185740), (10, 2092870), (13, 1609900), (17, 1231100), (20, 1046435), (25, 837148), (26, 804950), (34, 615550), (50, 418574), (52, 402475), (65, 321980), (68, 307775), (85, 246220), (100, 209287), (130, 160990), (170, 123110), (221, 94700), (260, 80495), (325, 64396), (340, 61555), (425, 49244), (442, 47350), (650, 32198), (850, 24622), (884, 23675), (947, 22100), (1105, 18940), (1300, 16099), (1700, 12311), (1894, 11050), (2210, 9470), (3788, 5525), (4420, 4735)]