21159920

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{13921}}^1$

素因数の和:13953

約数の個数: 40

約数和(自身を含む): 51789840

約数和(自身を除く): 30629920

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760, 1520, 13921, 27842, 55684, 69605, 111368, 139210, 222736, 264499, 278420, 528998, 556840, 1057996, 1113680, 1322495, 2115992, 2644990, 4231984, 5289980, 10579960, 21159920]

約数ペア:

[(1, 21159920), (2, 10579960), (4, 5289980), (5, 4231984), (8, 2644990), (10, 2115992), (16, 1322495), (19, 1113680), (20, 1057996), (38, 556840), (40, 528998), (76, 278420), (80, 264499), (95, 222736), (152, 139210), (190, 111368), (304, 69605), (380, 55684), (760, 27842), (1520, 13921)]