21118640

素因数分解:

$2^4\times 5^1\times {\mathrm{263983}}^1$

素因数の和:263996

約数の個数: 20

約数和(自身を含む): 49101024

約数和(自身を除く): 27982384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263983, 527966, 1055932, 1319915, 2111864, 2639830, 4223728, 5279660, 10559320, 21118640]

約数ペア:

[(1, 21118640), (2, 10559320), (4, 5279660), (5, 4223728), (8, 2639830), (10, 2111864), (16, 1319915), (20, 1055932), (40, 527966), (80, 263983)]