18712720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{947}}^1$

素因数の和:992

約数の個数: 80

約数和(自身を含む): 49371840

約数和(自身を除く): 30659120

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 38, 40, 52, 65, 76, 80, 95, 104, 130, 152, 190, 208, 247, 260, 304, 380, 494, 520, 760, 947, 988, 1040, 1235, 1520, 1894, 1976, 2470, 3788, 3952, 4735, 4940, 7576, 9470, 9880, 12311, 15152, 17993, 18940, 19760, 24622, 35986, 37880, 49244, 61555, 71972, 75760, 89965, 98488, 123110, 143944, 179930, 196976, 233909, 246220, 287888, 359860, 467818, 492440, 719720, 935636, 984880, 1169545, 1439440, 1871272, 2339090, 3742544, 4678180, 9356360, 18712720]

約数ペア:

[(1, 18712720), (2, 9356360), (4, 4678180), (5, 3742544), (8, 2339090), (10, 1871272), (13, 1439440), (16, 1169545), (19, 984880), (20, 935636), (26, 719720), (38, 492440), (40, 467818), (52, 359860), (65, 287888), (76, 246220), (80, 233909), (95, 196976), (104, 179930), (130, 143944), (152, 123110), (190, 98488), (208, 89965), (247, 75760), (260, 71972), (304, 61555), (380, 49244), (494, 37880), (520, 35986), (760, 24622), (947, 19760), (988, 18940), (1040, 17993), (1235, 15152), (1520, 12311), (1894, 9880), (1976, 9470), (2470, 7576), (3788, 4940), (3952, 4735)]