20800820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{43}}^1\times {\mathrm{67}}^1$

素因数の和:157

約数の個数: 72

約数和(自身を含む): 47877984

約数和(自身を除く): 27077164

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 43, 67, 76, 86, 95, 134, 172, 190, 215, 268, 335, 361, 380, 430, 670, 722, 817, 860, 1273, 1340, 1444, 1634, 1805, 2546, 2881, 3268, 3610, 4085, 5092, 5762, 6365, 7220, 8170, 11524, 12730, 14405, 15523, 16340, 24187, 25460, 28810, 31046, 48374, 54739, 57620, 62092, 77615, 96748, 109478, 120935, 155230, 218956, 241870, 273695, 310460, 483740, 547390, 1040041, 1094780, 2080082, 4160164, 5200205, 10400410, 20800820]

約数ペア:

[(1, 20800820), (2, 10400410), (4, 5200205), (5, 4160164), (10, 2080082), (19, 1094780), (20, 1040041), (38, 547390), (43, 483740), (67, 310460), (76, 273695), (86, 241870), (95, 218956), (134, 155230), (172, 120935), (190, 109478), (215, 96748), (268, 77615), (335, 62092), (361, 57620), (380, 54739), (430, 48374), (670, 31046), (722, 28810), (817, 25460), (860, 24187), (1273, 16340), (1340, 15523), (1444, 14405), (1634, 12730), (1805, 11524), (2546, 8170), (2881, 7220), (3268, 6365), (3610, 5762), (4085, 5092)]