18721840

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{113}}^1$

素因数の和:254

約数の個数: 80

約数和(自身を含む): 46648800

約数和(自身を除く): 27926960

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 109, 113, 152, 190, 218, 226, 304, 380, 436, 452, 545, 565, 760, 872, 904, 1090, 1130, 1520, 1744, 1808, 2071, 2147, 2180, 2260, 4142, 4294, 4360, 4520, 8284, 8588, 8720, 9040, 10355, 10735, 12317, 16568, 17176, 20710, 21470, 24634, 33136, 34352, 41420, 42940, 49268, 61585, 82840, 85880, 98536, 123170, 165680, 171760, 197072, 234023, 246340, 468046, 492680, 936092, 985360, 1170115, 1872184, 2340230, 3744368, 4680460, 9360920, 18721840]

約数ペア:

[(1, 18721840), (2, 9360920), (4, 4680460), (5, 3744368), (8, 2340230), (10, 1872184), (16, 1170115), (19, 985360), (20, 936092), (38, 492680), (40, 468046), (76, 246340), (80, 234023), (95, 197072), (109, 171760), (113, 165680), (152, 123170), (190, 98536), (218, 85880), (226, 82840), (304, 61585), (380, 49268), (436, 42940), (452, 41420), (545, 34352), (565, 33136), (760, 24634), (872, 21470), (904, 20710), (1090, 17176), (1130, 16568), (1520, 12317), (1744, 10735), (1808, 10355), (2071, 9040), (2147, 8720), (2180, 8588), (2260, 8284), (4142, 4520), (4294, 4360)]