21177680

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2621}}^1$

素因数の和:2735

約数の個数: 40

約数和(自身を含む): 49744584

約数和(自身を除く): 28566904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2621, 4040, 5242, 8080, 10484, 13105, 20968, 26210, 41936, 52420, 104840, 209680, 264721, 529442, 1058884, 1323605, 2117768, 2647210, 4235536, 5294420, 10588840, 21177680]

約数ペア:

[(1, 21177680), (2, 10588840), (4, 5294420), (5, 4235536), (8, 2647210), (10, 2117768), (16, 1323605), (20, 1058884), (40, 529442), (80, 264721), (101, 209680), (202, 104840), (404, 52420), (505, 41936), (808, 26210), (1010, 20968), (1616, 13105), (2020, 10484), (2621, 8080), (4040, 5242)]