639986560

素因数分解:

$2^7\times 5^1\times {\mathrm{999979}}^1$

素因数の和:999998

約数の個数: 32

約数和(自身を含む): 1529969400

約数和(自身を除く): 889982840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 999979, 1999958, 3999916, 4999895, 7999832, 9999790, 15999664, 19999580, 31999328, 39999160, 63998656, 79998320, 127997312, 159996640, 319993280, 639986560]

約数ペア:

[(1, 639986560), (2, 319993280), (4, 159996640), (5, 127997312), (8, 79998320), (10, 63998656), (16, 39999160), (20, 31999328), (32, 19999580), (40, 15999664), (64, 9999790), (80, 7999832), (128, 4999895), (160, 3999916), (320, 1999958), (640, 999979)]