21565520

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{157}}^1$

素因数の和:288

約数の個数: 80

約数和(自身を含む): 53956368

約数和(自身を除く): 32390848

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 101, 136, 157, 170, 202, 272, 314, 340, 404, 505, 628, 680, 785, 808, 1010, 1256, 1360, 1570, 1616, 1717, 2020, 2512, 2669, 3140, 3434, 4040, 5338, 6280, 6868, 8080, 8585, 10676, 12560, 13345, 13736, 15857, 17170, 21352, 26690, 27472, 31714, 34340, 42704, 53380, 63428, 68680, 79285, 106760, 126856, 137360, 158570, 213520, 253712, 269569, 317140, 539138, 634280, 1078276, 1268560, 1347845, 2156552, 2695690, 4313104, 5391380, 10782760, 21565520]

約数ペア:

[(1, 21565520), (2, 10782760), (4, 5391380), (5, 4313104), (8, 2695690), (10, 2156552), (16, 1347845), (17, 1268560), (20, 1078276), (34, 634280), (40, 539138), (68, 317140), (80, 269569), (85, 253712), (101, 213520), (136, 158570), (157, 137360), (170, 126856), (202, 106760), (272, 79285), (314, 68680), (340, 63428), (404, 53380), (505, 42704), (628, 34340), (680, 31714), (785, 27472), (808, 26690), (1010, 21352), (1256, 17170), (1360, 15857), (1570, 13736), (1616, 13345), (1717, 12560), (2020, 10676), (2512, 8585), (2669, 8080), (3140, 6868), (3434, 6280), (4040, 5338)]