21525760

素因数分解:

$2^8\times 5^1\times {\mathrm{67}}^1\times {\mathrm{251}}^1$

素因数の和:339

約数の個数: 72

約数和(自身を含む): 52538976

約数和(自身を除く): 31013216

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 128, 134, 160, 251, 256, 268, 320, 335, 502, 536, 640, 670, 1004, 1072, 1255, 1280, 1340, 2008, 2144, 2510, 2680, 4016, 4288, 5020, 5360, 8032, 8576, 10040, 10720, 16064, 16817, 17152, 20080, 21440, 32128, 33634, 40160, 42880, 64256, 67268, 80320, 84085, 85760, 134536, 160640, 168170, 269072, 321280, 336340, 538144, 672680, 1076288, 1345360, 2152576, 2690720, 4305152, 5381440, 10762880, 21525760]

約数ペア:

[(1, 21525760), (2, 10762880), (4, 5381440), (5, 4305152), (8, 2690720), (10, 2152576), (16, 1345360), (20, 1076288), (32, 672680), (40, 538144), (64, 336340), (67, 321280), (80, 269072), (128, 168170), (134, 160640), (160, 134536), (251, 85760), (256, 84085), (268, 80320), (320, 67268), (335, 64256), (502, 42880), (536, 40160), (640, 33634), (670, 32128), (1004, 21440), (1072, 20080), (1255, 17152), (1280, 16817), (1340, 16064), (2008, 10720), (2144, 10040), (2510, 8576), (2680, 8032), (4016, 5360), (4288, 5020)]