20129980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{557}}^1$

素因数の和:718

約数の個数: 48

約数和(自身を含む): 45934560

約数和(自身を除く): 25804580

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 139, 260, 278, 556, 557, 695, 1114, 1390, 1807, 2228, 2780, 2785, 3614, 5570, 7228, 7241, 9035, 11140, 14482, 18070, 28964, 36140, 36205, 72410, 77423, 144820, 154846, 309692, 387115, 774230, 1006499, 1548460, 2012998, 4025996, 5032495, 10064990, 20129980]

約数ペア:

[(1, 20129980), (2, 10064990), (4, 5032495), (5, 4025996), (10, 2012998), (13, 1548460), (20, 1006499), (26, 774230), (52, 387115), (65, 309692), (130, 154846), (139, 144820), (260, 77423), (278, 72410), (556, 36205), (557, 36140), (695, 28964), (1114, 18070), (1390, 14482), (1807, 11140), (2228, 9035), (2780, 7241), (2785, 7228), (3614, 5570)]