666640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{641}}^1$

素因数の和:667

約数の個数: 40

約数和(自身を含む): 1671768

約数和(自身を除く): 1005128

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 641, 1040, 1282, 2564, 3205, 5128, 6410, 8333, 10256, 12820, 16666, 25640, 33332, 41665, 51280, 66664, 83330, 133328, 166660, 333320, 666640]

約数ペア:

[(1, 666640), (2, 333320), (4, 166660), (5, 133328), (8, 83330), (10, 66664), (13, 51280), (16, 41665), (20, 33332), (26, 25640), (40, 16666), (52, 12820), (65, 10256), (80, 8333), (104, 6410), (130, 5128), (208, 3205), (260, 2564), (520, 1282), (641, 1040)]