21561820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{233}}^1\times {\mathrm{661}}^1$

素因数の和:910

約数の個数: 48

約数和(自身を含む): 52049088

約数和(自身を除く): 30487268

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 233, 466, 661, 932, 1165, 1322, 1631, 2330, 2644, 3262, 3305, 4627, 4660, 6524, 6610, 8155, 9254, 13220, 16310, 18508, 23135, 32620, 46270, 92540, 154013, 308026, 616052, 770065, 1078091, 1540130, 2156182, 3080260, 4312364, 5390455, 10780910, 21561820]

約数ペア:

[(1, 21561820), (2, 10780910), (4, 5390455), (5, 4312364), (7, 3080260), (10, 2156182), (14, 1540130), (20, 1078091), (28, 770065), (35, 616052), (70, 308026), (140, 154013), (233, 92540), (466, 46270), (661, 32620), (932, 23135), (1165, 18508), (1322, 16310), (1631, 13220), (2330, 9254), (2644, 8155), (3262, 6610), (3305, 6524), (4627, 4660)]