21663880

素因数分解:

$2^3\times 5^1\times 7^3\times {\mathrm{1579}}^1$

素因数の和:1611

約数の個数: 64

約数和(自身を含む): 56880000

約数和(自身を除く): 35216120

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 343, 392, 490, 686, 980, 1372, 1579, 1715, 1960, 2744, 3158, 3430, 6316, 6860, 7895, 11053, 12632, 13720, 15790, 22106, 31580, 44212, 55265, 63160, 77371, 88424, 110530, 154742, 221060, 309484, 386855, 442120, 541597, 618968, 773710, 1083194, 1547420, 2166388, 2707985, 3094840, 4332776, 5415970, 10831940, 21663880]

約数ペア:

[(1, 21663880), (2, 10831940), (4, 5415970), (5, 4332776), (7, 3094840), (8, 2707985), (10, 2166388), (14, 1547420), (20, 1083194), (28, 773710), (35, 618968), (40, 541597), (49, 442120), (56, 386855), (70, 309484), (98, 221060), (140, 154742), (196, 110530), (245, 88424), (280, 77371), (343, 63160), (392, 55265), (490, 44212), (686, 31580), (980, 22106), (1372, 15790), (1579, 13720), (1715, 12632), (1960, 11053), (2744, 7895), (3158, 6860), (3430, 6316)]