20518420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1489}}^1$

素因数の和:1564

約数の個数: 48

約数和(自身を含む): 47310480

約数和(自身を除く): 26792060

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1489, 2756, 2978, 3445, 5956, 6890, 7445, 13780, 14890, 19357, 29780, 38714, 77428, 78917, 96785, 157834, 193570, 315668, 387140, 394585, 789170, 1025921, 1578340, 2051842, 4103684, 5129605, 10259210, 20518420]

約数ペア:

[(1, 20518420), (2, 10259210), (4, 5129605), (5, 4103684), (10, 2051842), (13, 1578340), (20, 1025921), (26, 789170), (52, 394585), (53, 387140), (65, 315668), (106, 193570), (130, 157834), (212, 96785), (260, 78917), (265, 77428), (530, 38714), (689, 29780), (1060, 19357), (1378, 14890), (1489, 13780), (2756, 7445), (2978, 6890), (3445, 5956)]