19903984

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{40129}}^1$

素因数の和:40168

約数の個数: 20

約数和(自身を含む): 39808960

約数和(自身を除く): 19904976

約数列:

[1, 2, 4, 8, 16, 31, 62, 124, 248, 496, 40129, 80258, 160516, 321032, 642064, 1243999, 2487998, 4975996, 9951992, 19903984]

約数ペア:

[(1, 19903984), (2, 9951992), (4, 4975996), (8, 2487998), (16, 1243999), (31, 642064), (62, 321032), (124, 160516), (248, 80258), (496, 40129)]