21550720

素因数分解:

$2^7\times 5^1\times {\mathrm{151}}^1\times {\mathrm{223}}^1$

素因数の和:393

約数の個数: 64

約数和(自身を含む): 52093440

約数和(自身を除く): 30542720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 151, 160, 223, 302, 320, 446, 604, 640, 755, 892, 1115, 1208, 1510, 1784, 2230, 2416, 3020, 3568, 4460, 4832, 6040, 7136, 8920, 9664, 12080, 14272, 17840, 19328, 24160, 28544, 33673, 35680, 48320, 67346, 71360, 96640, 134692, 142720, 168365, 269384, 336730, 538768, 673460, 1077536, 1346920, 2155072, 2693840, 4310144, 5387680, 10775360, 21550720]

約数ペア:

[(1, 21550720), (2, 10775360), (4, 5387680), (5, 4310144), (8, 2693840), (10, 2155072), (16, 1346920), (20, 1077536), (32, 673460), (40, 538768), (64, 336730), (80, 269384), (128, 168365), (151, 142720), (160, 134692), (223, 96640), (302, 71360), (320, 67346), (446, 48320), (604, 35680), (640, 33673), (755, 28544), (892, 24160), (1115, 19328), (1208, 17840), (1510, 14272), (1784, 12080), (2230, 9664), (2416, 8920), (3020, 7136), (3568, 6040), (4460, 4832)]