20998990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{1399}}^1$

素因数の和:1504

約数の個数: 32

約数和(自身を含む): 40320000

約数和(自身を除く): 19321010

約数列:

[1, 2, 5, 10, 19, 38, 79, 95, 158, 190, 395, 790, 1399, 1501, 2798, 3002, 6995, 7505, 13990, 15010, 26581, 53162, 110521, 132905, 221042, 265810, 552605, 1105210, 2099899, 4199798, 10499495, 20998990]

約数ペア:

[(1, 20998990), (2, 10499495), (5, 4199798), (10, 2099899), (19, 1105210), (38, 552605), (79, 265810), (95, 221042), (158, 132905), (190, 110521), (395, 53162), (790, 26581), (1399, 15010), (1501, 13990), (2798, 7505), (3002, 6995)]