20639290

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{73}}^1\times {\mathrm{577}}^1$

素因数の和:671

約数の個数: 48

約数和(自身を含む): 43884072

約数和(自身を除く): 23244782

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 73, 98, 146, 245, 365, 490, 511, 577, 730, 1022, 1154, 2555, 2885, 3577, 4039, 5110, 5770, 7154, 8078, 17885, 20195, 28273, 35770, 40390, 42121, 56546, 84242, 141365, 210605, 282730, 294847, 421210, 589694, 1474235, 2063929, 2948470, 4127858, 10319645, 20639290]

約数ペア:

[(1, 20639290), (2, 10319645), (5, 4127858), (7, 2948470), (10, 2063929), (14, 1474235), (35, 589694), (49, 421210), (70, 294847), (73, 282730), (98, 210605), (146, 141365), (245, 84242), (365, 56546), (490, 42121), (511, 40390), (577, 35770), (730, 28273), (1022, 20195), (1154, 17885), (2555, 8078), (2885, 7154), (3577, 5770), (4039, 5110)]