21499120

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8669}}^1$

素因数の和:8713

約数の個数: 40

約数和(自身を含む): 51603840

約数和(自身を除く): 30104720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8669, 17338, 34676, 43345, 69352, 86690, 138704, 173380, 268739, 346760, 537478, 693520, 1074956, 1343695, 2149912, 2687390, 4299824, 5374780, 10749560, 21499120]

約数ペア:

[(1, 21499120), (2, 10749560), (4, 5374780), (5, 4299824), (8, 2687390), (10, 2149912), (16, 1343695), (20, 1074956), (31, 693520), (40, 537478), (62, 346760), (80, 268739), (124, 173380), (155, 138704), (248, 86690), (310, 69352), (496, 43345), (620, 34676), (1240, 17338), (2480, 8669)]