81991600

素因数分解:

$2^4\times 5^2\times {\mathrm{204979}}^1$

素因数の和:204997

約数の個数: 30

約数和(自身を含む): 196985780

約数和(自身を除く): 114994180

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 204979, 409958, 819916, 1024895, 1639832, 2049790, 3279664, 4099580, 5124475, 8199160, 10248950, 16398320, 20497900, 40995800, 81991600]

約数ペア:

[(1, 81991600), (2, 40995800), (4, 20497900), (5, 16398320), (8, 10248950), (10, 8199160), (16, 5124475), (20, 4099580), (25, 3279664), (40, 2049790), (50, 1639832), (80, 1024895), (100, 819916), (200, 409958), (400, 204979)]