21213940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{211}}^1\times {\mathrm{457}}^1$

素因数の和:688

約数の個数: 48

約数和(自身を含む): 48936384

約数和(自身を除く): 27722444

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 211, 220, 422, 457, 844, 914, 1055, 1828, 2110, 2285, 2321, 4220, 4570, 4642, 5027, 9140, 9284, 10054, 11605, 20108, 23210, 25135, 46420, 50270, 96427, 100540, 192854, 385708, 482135, 964270, 1060697, 1928540, 2121394, 4242788, 5303485, 10606970, 21213940]

約数ペア:

[(1, 21213940), (2, 10606970), (4, 5303485), (5, 4242788), (10, 2121394), (11, 1928540), (20, 1060697), (22, 964270), (44, 482135), (55, 385708), (110, 192854), (211, 100540), (220, 96427), (422, 50270), (457, 46420), (844, 25135), (914, 23210), (1055, 20108), (1828, 11605), (2110, 10054), (2285, 9284), (2321, 9140), (4220, 5027), (4570, 4642)]