19917280

素因数分解:

$2^5\times 5^1\times {\mathrm{281}}^1\times {\mathrm{443}}^1$

素因数の和:739

約数の個数: 48

約数和(自身を含む): 47328624

約数和(自身を除く): 27411344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 281, 443, 562, 886, 1124, 1405, 1772, 2215, 2248, 2810, 3544, 4430, 4496, 5620, 7088, 8860, 8992, 11240, 14176, 17720, 22480, 35440, 44960, 70880, 124483, 248966, 497932, 622415, 995864, 1244830, 1991728, 2489660, 3983456, 4979320, 9958640, 19917280]

約数ペア:

[(1, 19917280), (2, 9958640), (4, 4979320), (5, 3983456), (8, 2489660), (10, 1991728), (16, 1244830), (20, 995864), (32, 622415), (40, 497932), (80, 248966), (160, 124483), (281, 70880), (443, 44960), (562, 35440), (886, 22480), (1124, 17720), (1405, 14176), (1772, 11240), (2215, 8992), (2248, 8860), (2810, 7088), (3544, 5620), (4430, 4496)]