18716920

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{953}}^1$

素因数の和:1455

約数の個数: 32

約数和(自身を含む): 42243120

約数和(自身を除く): 23526200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 953, 982, 1906, 1964, 2455, 3812, 3928, 4765, 4910, 7624, 9530, 9820, 19060, 19640, 38120, 467923, 935846, 1871692, 2339615, 3743384, 4679230, 9358460, 18716920]

約数ペア:

[(1, 18716920), (2, 9358460), (4, 4679230), (5, 3743384), (8, 2339615), (10, 1871692), (20, 935846), (40, 467923), (491, 38120), (953, 19640), (982, 19060), (1906, 9820), (1964, 9530), (2455, 7624), (3812, 4910), (3928, 4765)]