648719020

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{491}}^1\times {\mathrm{2131}}^1$

素因数の和:2662

約数の個数: 48

約数和(自身を含む): 1409780736

約数和(自身を除く): 761061716

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 491, 620, 982, 1964, 2131, 2455, 4262, 4910, 8524, 9820, 10655, 15221, 21310, 30442, 42620, 60884, 66061, 76105, 132122, 152210, 264244, 304420, 330305, 660610, 1046321, 1321220, 2092642, 4185284, 5231605, 10463210, 20926420, 32435951, 64871902, 129743804, 162179755, 324359510, 648719020]

約数ペア:

[(1, 648719020), (2, 324359510), (4, 162179755), (5, 129743804), (10, 64871902), (20, 32435951), (31, 20926420), (62, 10463210), (124, 5231605), (155, 4185284), (310, 2092642), (491, 1321220), (620, 1046321), (982, 660610), (1964, 330305), (2131, 304420), (2455, 264244), (4262, 152210), (4910, 132122), (8524, 76105), (9820, 66061), (10655, 60884), (15221, 42620), (21310, 30442)]