20401680

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{503}}^1$

素因数の和:545

約数の個数: 120

約数和(自身を含む): 68620608

約数和(自身を除く): 48218928

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 39, 40, 48, 52, 60, 65, 78, 80, 104, 120, 130, 156, 169, 195, 208, 240, 260, 312, 338, 390, 503, 507, 520, 624, 676, 780, 845, 1006, 1014, 1040, 1352, 1509, 1560, 1690, 2012, 2028, 2515, 2535, 2704, 3018, 3120, 3380, 4024, 4056, 5030, 5070, 6036, 6539, 6760, 7545, 8048, 8112, 10060, 10140, 12072, 13078, 13520, 15090, 19617, 20120, 20280, 24144, 26156, 30180, 32695, 39234, 40240, 40560, 52312, 60360, 65390, 78468, 85007, 98085, 104624, 120720, 130780, 156936, 170014, 196170, 255021, 261560, 313872, 340028, 392340, 425035, 510042, 523120, 680056, 784680, 850070, 1020084, 1275105, 1360112, 1569360, 1700140, 2040168, 2550210, 3400280, 4080336, 5100420, 6800560, 10200840, 20401680]

約数ペア:

[(1, 20401680), (2, 10200840), (3, 6800560), (4, 5100420), (5, 4080336), (6, 3400280), (8, 2550210), (10, 2040168), (12, 1700140), (13, 1569360), (15, 1360112), (16, 1275105), (20, 1020084), (24, 850070), (26, 784680), (30, 680056), (39, 523120), (40, 510042), (48, 425035), (52, 392340), (60, 340028), (65, 313872), (78, 261560), (80, 255021), (104, 196170), (120, 170014), (130, 156936), (156, 130780), (169, 120720), (195, 104624), (208, 98085), (240, 85007), (260, 78468), (312, 65390), (338, 60360), (390, 52312), (503, 40560), (507, 40240), (520, 39234), (624, 32695), (676, 30180), (780, 26156), (845, 24144), (1006, 20280), (1014, 20120), (1040, 19617), (1352, 15090), (1509, 13520), (1560, 13078), (1690, 12072), (2012, 10140), (2028, 10060), (2515, 8112), (2535, 8048), (2704, 7545), (3018, 6760), (3120, 6539), (3380, 6036), (4024, 5070), (4056, 5030)]