21660640

素因数分解:

$2^5\times 5^1\times {\mathrm{331}}^1\times {\mathrm{409}}^1$

素因数の和:755

約数の個数: 48

約数和(自身を含む): 51453360

約数和(自身を除く): 29792720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 331, 409, 662, 818, 1324, 1636, 1655, 2045, 2648, 3272, 3310, 4090, 5296, 6544, 6620, 8180, 10592, 13088, 13240, 16360, 26480, 32720, 52960, 65440, 135379, 270758, 541516, 676895, 1083032, 1353790, 2166064, 2707580, 4332128, 5415160, 10830320, 21660640]

約数ペア:

[(1, 21660640), (2, 10830320), (4, 5415160), (5, 4332128), (8, 2707580), (10, 2166064), (16, 1353790), (20, 1083032), (32, 676895), (40, 541516), (80, 270758), (160, 135379), (331, 65440), (409, 52960), (662, 32720), (818, 26480), (1324, 16360), (1636, 13240), (1655, 13088), (2045, 10592), (2648, 8180), (3272, 6620), (3310, 6544), (4090, 5296)]