19977640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16111}}^1$

素因数の和:16153

約数の個数: 32

約数和(自身を含む): 46402560

約数和(自身を除く): 26424920

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16111, 32222, 64444, 80555, 128888, 161110, 322220, 499441, 644440, 998882, 1997764, 2497205, 3995528, 4994410, 9988820, 19977640]

約数ペア:

[(1, 19977640), (2, 9988820), (4, 4994410), (5, 3995528), (8, 2497205), (10, 1997764), (20, 998882), (31, 644440), (40, 499441), (62, 322220), (124, 161110), (155, 128888), (248, 80555), (310, 64444), (620, 32222), (1240, 16111)]