21457904

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{1453}}^1$

素因数の和:1545

約数の個数: 40

約数和(自身を含む): 45434592

約数和(自身を除く): 23976688

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 71, 104, 142, 208, 284, 568, 923, 1136, 1453, 1846, 2906, 3692, 5812, 7384, 11624, 14768, 18889, 23248, 37778, 75556, 103163, 151112, 206326, 302224, 412652, 825304, 1341119, 1650608, 2682238, 5364476, 10728952, 21457904]

約数ペア:

[(1, 21457904), (2, 10728952), (4, 5364476), (8, 2682238), (13, 1650608), (16, 1341119), (26, 825304), (52, 412652), (71, 302224), (104, 206326), (142, 151112), (208, 103163), (284, 75556), (568, 37778), (923, 23248), (1136, 18889), (1453, 14768), (1846, 11624), (2906, 7384), (3692, 5812)]