81380920

素因数分解:

$2^3\times 5^1\times {\mathrm{991}}^1\times {\mathrm{2053}}^1$

素因数の和:3055

約数の個数: 32

約数和(自身を含む): 183381120

約数和(自身を除く): 102000200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 991, 1982, 2053, 3964, 4106, 4955, 7928, 8212, 9910, 10265, 16424, 19820, 20530, 39640, 41060, 82120, 2034523, 4069046, 8138092, 10172615, 16276184, 20345230, 40690460, 81380920]

約数ペア:

[(1, 81380920), (2, 40690460), (4, 20345230), (5, 16276184), (8, 10172615), (10, 8138092), (20, 4069046), (40, 2034523), (991, 82120), (1982, 41060), (2053, 39640), (3964, 20530), (4106, 19820), (4955, 16424), (7928, 10265), (8212, 9910)]