18808840

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{1091}}^1$

素因数の和:1533

約数の個数: 32

約数和(自身を含む): 42456960

約数和(自身を除く): 23648120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1091, 1724, 2155, 2182, 3448, 4310, 4364, 5455, 8620, 8728, 10910, 17240, 21820, 43640, 470221, 940442, 1880884, 2351105, 3761768, 4702210, 9404420, 18808840]

約数ペア:

[(1, 18808840), (2, 9404420), (4, 4702210), (5, 3761768), (8, 2351105), (10, 1880884), (20, 940442), (40, 470221), (431, 43640), (862, 21820), (1091, 17240), (1724, 10910), (2155, 8728), (2182, 8620), (3448, 5455), (4310, 4364)]