81000400

素因数分解:

$2^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{421}}^1$

素因数の和:489

約数の個数: 120

約数和(自身を含む): 215748344

約数和(自身を除く): 134747944

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 37, 40, 50, 52, 65, 74, 80, 100, 104, 130, 148, 185, 200, 208, 260, 296, 325, 370, 400, 421, 481, 520, 592, 650, 740, 842, 925, 962, 1040, 1300, 1480, 1684, 1850, 1924, 2105, 2405, 2600, 2960, 3368, 3700, 3848, 4210, 4810, 5200, 5473, 6736, 7400, 7696, 8420, 9620, 10525, 10946, 12025, 14800, 15577, 16840, 19240, 21050, 21892, 24050, 27365, 31154, 33680, 38480, 42100, 43784, 48100, 54730, 62308, 77885, 84200, 87568, 96200, 109460, 124616, 136825, 155770, 168400, 192400, 202501, 218920, 249232, 273650, 311540, 389425, 405002, 437840, 547300, 623080, 778850, 810004, 1012505, 1094600, 1246160, 1557700, 1620008, 2025010, 2189200, 3115400, 3240016, 4050020, 5062525, 6230800, 8100040, 10125050, 16200080, 20250100, 40500200, 81000400]

約数ペア:

[(1, 81000400), (2, 40500200), (4, 20250100), (5, 16200080), (8, 10125050), (10, 8100040), (13, 6230800), (16, 5062525), (20, 4050020), (25, 3240016), (26, 3115400), (37, 2189200), (40, 2025010), (50, 1620008), (52, 1557700), (65, 1246160), (74, 1094600), (80, 1012505), (100, 810004), (104, 778850), (130, 623080), (148, 547300), (185, 437840), (200, 405002), (208, 389425), (260, 311540), (296, 273650), (325, 249232), (370, 218920), (400, 202501), (421, 192400), (481, 168400), (520, 155770), (592, 136825), (650, 124616), (740, 109460), (842, 96200), (925, 87568), (962, 84200), (1040, 77885), (1300, 62308), (1480, 54730), (1684, 48100), (1850, 43784), (1924, 42100), (2105, 38480), (2405, 33680), (2600, 31154), (2960, 27365), (3368, 24050), (3700, 21892), (3848, 21050), (4210, 19240), (4810, 16840), (5200, 15577), (5473, 14800), (6736, 12025), (7400, 10946), (7696, 10525), (8420, 9620)]