19982920

素因数分解:

$2^3\times 5^1\times {\mathrm{113}}^1\times {\mathrm{4421}}^1$

素因数の和:4545

約数の個数: 32

約数和(自身を含む): 45369720

約数和(自身を除く): 25386800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 113, 226, 452, 565, 904, 1130, 2260, 4421, 4520, 8842, 17684, 22105, 35368, 44210, 88420, 176840, 499573, 999146, 1998292, 2497865, 3996584, 4995730, 9991460, 19982920]

約数ペア:

[(1, 19982920), (2, 9991460), (4, 4995730), (5, 3996584), (8, 2497865), (10, 1998292), (20, 999146), (40, 499573), (113, 176840), (226, 88420), (452, 44210), (565, 35368), (904, 22105), (1130, 17684), (2260, 8842), (4421, 4520)]