639213040

素因数分解:

$2^4\times 5^1\times {\mathrm{7990163}}^1$

素因数の和:7990176

約数の個数: 20

約数和(自身を含む): 1486170504

約数和(自身を除く): 846957464

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7990163, 15980326, 31960652, 39950815, 63921304, 79901630, 127842608, 159803260, 319606520, 639213040]

約数ペア:

[(1, 639213040), (2, 319606520), (4, 159803260), (5, 127842608), (8, 79901630), (10, 63921304), (16, 39950815), (20, 31960652), (40, 15980326), (80, 7990163)]