20781890

素因数分解:

$2^1\times 5^1\times {\mathrm{139}}^1\times {\mathrm{14951}}^1$

素因数の和:15097

約数の個数: 16

約数和(自身を含む): 37679040

約数和(自身を除く): 16897150

約数列:

[1, 2, 5, 10, 139, 278, 695, 1390, 14951, 29902, 74755, 149510, 2078189, 4156378, 10390945, 20781890]

約数ペア:

[(1, 20781890), (2, 10390945), (5, 4156378), (10, 2078189), (139, 149510), (278, 74755), (695, 29902), (1390, 14951)]