18011980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{128657}}^1$

素因数の和:128673

約数の個数: 24

約数和(自身を含む): 43229088

約数和(自身を除く): 25217108

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 128657, 257314, 514628, 643285, 900599, 1286570, 1801198, 2573140, 3602396, 4502995, 9005990, 18011980]

約数ペア:

[(1, 18011980), (2, 9005990), (4, 4502995), (5, 3602396), (7, 2573140), (10, 1801198), (14, 1286570), (20, 900599), (28, 643285), (35, 514628), (70, 257314), (140, 128657)]