21000251986

素因数分解:

$2^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{311}}^1\times {\mathrm{2137}}^1$

素因数の和:2555

約数の個数: 64

約数和(自身を含む): 37718014464

約数和(自身を除く): 16717762478

約数列:

[1, 2, 7, 14, 37, 61, 74, 122, 259, 311, 427, 518, 622, 854, 2137, 2177, 2257, 4274, 4354, 4514, 11507, 14959, 15799, 18971, 23014, 29918, 31598, 37942, 79069, 80549, 130357, 132797, 158138, 161098, 260714, 265594, 553483, 664607, 701927, 912499, 1106966, 1329214, 1403854, 1824998, 4652249, 4823209, 4913489, 9304498, 9646418, 9826978, 24590459, 33762463, 40541027, 49180918, 67524926, 81082054, 172133213, 283787189, 344266426, 567574378, 1500017999, 3000035998, 10500125993, 21000251986]

約数ペア:

[(1, 21000251986), (2, 10500125993), (7, 3000035998), (14, 1500017999), (37, 567574378), (61, 344266426), (74, 283787189), (122, 172133213), (259, 81082054), (311, 67524926), (427, 49180918), (518, 40541027), (622, 33762463), (854, 24590459), (2137, 9826978), (2177, 9646418), (2257, 9304498), (4274, 4913489), (4354, 4823209), (4514, 4652249), (11507, 1824998), (14959, 1403854), (15799, 1329214), (18971, 1106966), (23014, 912499), (29918, 701927), (31598, 664607), (37942, 553483), (79069, 265594), (80549, 260714), (130357, 161098), (132797, 158138)]