19798760

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{239}}^1$

素因数の和:378

約数の個数: 64

約数和(自身を含む): 47520000

約数和(自身を除く): 27721240

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 109, 152, 190, 218, 239, 380, 436, 478, 545, 760, 872, 956, 1090, 1195, 1912, 2071, 2180, 2390, 4142, 4360, 4541, 4780, 8284, 9082, 9560, 10355, 16568, 18164, 20710, 22705, 26051, 36328, 41420, 45410, 52102, 82840, 90820, 104204, 130255, 181640, 208408, 260510, 494969, 521020, 989938, 1042040, 1979876, 2474845, 3959752, 4949690, 9899380, 19798760]

約数ペア:

[(1, 19798760), (2, 9899380), (4, 4949690), (5, 3959752), (8, 2474845), (10, 1979876), (19, 1042040), (20, 989938), (38, 521020), (40, 494969), (76, 260510), (95, 208408), (109, 181640), (152, 130255), (190, 104204), (218, 90820), (239, 82840), (380, 52102), (436, 45410), (478, 41420), (545, 36328), (760, 26051), (872, 22705), (956, 20710), (1090, 18164), (1195, 16568), (1912, 10355), (2071, 9560), (2180, 9082), (2390, 8284), (4142, 4780), (4360, 4541)]