21043840

素因数分解:

$2^7\times 5^1\times {\mathrm{131}}^1\times {\mathrm{251}}^1$

素因数の和:401

約数の個数: 64

約数和(自身を含む): 50893920

約数和(自身を除く): 29850080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 131, 160, 251, 262, 320, 502, 524, 640, 655, 1004, 1048, 1255, 1310, 2008, 2096, 2510, 2620, 4016, 4192, 5020, 5240, 8032, 8384, 10040, 10480, 16064, 16768, 20080, 20960, 32128, 32881, 40160, 41920, 65762, 80320, 83840, 131524, 160640, 164405, 263048, 328810, 526096, 657620, 1052192, 1315240, 2104384, 2630480, 4208768, 5260960, 10521920, 21043840]

約数ペア:

[(1, 21043840), (2, 10521920), (4, 5260960), (5, 4208768), (8, 2630480), (10, 2104384), (16, 1315240), (20, 1052192), (32, 657620), (40, 526096), (64, 328810), (80, 263048), (128, 164405), (131, 160640), (160, 131524), (251, 83840), (262, 80320), (320, 65762), (502, 41920), (524, 40160), (640, 32881), (655, 32128), (1004, 20960), (1048, 20080), (1255, 16768), (1310, 16064), (2008, 10480), (2096, 10040), (2510, 8384), (2620, 8032), (4016, 5240), (4192, 5020)]