20780540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{277}}^1$

素因数の和:339

約数の個数: 72

約数和(自身を含む): 49693056

約数和(自身を除く): 28912516

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 31, 44, 55, 62, 110, 121, 124, 155, 220, 242, 277, 310, 341, 484, 554, 605, 620, 682, 1108, 1210, 1364, 1385, 1705, 2420, 2770, 3047, 3410, 3751, 5540, 6094, 6820, 7502, 8587, 12188, 15004, 15235, 17174, 18755, 30470, 33517, 34348, 37510, 42935, 60940, 67034, 75020, 85870, 94457, 134068, 167585, 171740, 188914, 335170, 377828, 472285, 670340, 944570, 1039027, 1889140, 2078054, 4156108, 5195135, 10390270, 20780540]

約数ペア:

[(1, 20780540), (2, 10390270), (4, 5195135), (5, 4156108), (10, 2078054), (11, 1889140), (20, 1039027), (22, 944570), (31, 670340), (44, 472285), (55, 377828), (62, 335170), (110, 188914), (121, 171740), (124, 167585), (155, 134068), (220, 94457), (242, 85870), (277, 75020), (310, 67034), (341, 60940), (484, 42935), (554, 37510), (605, 34348), (620, 33517), (682, 30470), (1108, 18755), (1210, 17174), (1364, 15235), (1385, 15004), (1705, 12188), (2420, 8587), (2770, 7502), (3047, 6820), (3410, 6094), (3751, 5540)]