81284920

素因数分解:

$2^3\times 5^1\times {\mathrm{1249}}^1\times {\mathrm{1627}}^1$

素因数の和:2887

約数の個数: 32

約数和(自身を含む): 183150000

約数和(自身を除く): 101865080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1249, 1627, 2498, 3254, 4996, 6245, 6508, 8135, 9992, 12490, 13016, 16270, 24980, 32540, 49960, 65080, 2032123, 4064246, 8128492, 10160615, 16256984, 20321230, 40642460, 81284920]

約数ペア:

[(1, 81284920), (2, 40642460), (4, 20321230), (5, 16256984), (8, 10160615), (10, 8128492), (20, 4064246), (40, 2032123), (1249, 65080), (1627, 49960), (2498, 32540), (3254, 24980), (4996, 16270), (6245, 13016), (6508, 12490), (8135, 9992)]