21535840

素因数分解:

$2^5\times 5^1\times {\mathrm{281}}^1\times {\mathrm{479}}^1$

素因数の和:775

約数の個数: 48

約数和(自身を含む): 51166080

約数和(自身を除く): 29630240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 281, 479, 562, 958, 1124, 1405, 1916, 2248, 2395, 2810, 3832, 4496, 4790, 5620, 7664, 8992, 9580, 11240, 15328, 19160, 22480, 38320, 44960, 76640, 134599, 269198, 538396, 672995, 1076792, 1345990, 2153584, 2691980, 4307168, 5383960, 10767920, 21535840]

約数ペア:

[(1, 21535840), (2, 10767920), (4, 5383960), (5, 4307168), (8, 2691980), (10, 2153584), (16, 1345990), (20, 1076792), (32, 672995), (40, 538396), (80, 269198), (160, 134599), (281, 76640), (479, 44960), (562, 38320), (958, 22480), (1124, 19160), (1405, 15328), (1916, 11240), (2248, 9580), (2395, 8992), (2810, 7664), (3832, 5620), (4496, 4790)]