21199780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{929}}^1$

素因数の和:1108

約数の個数: 48

約数和(自身を含む): 51246720

約数和(自身を除く): 30046940

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 163, 326, 652, 815, 929, 1141, 1630, 1858, 2282, 3260, 3716, 4564, 4645, 5705, 6503, 9290, 11410, 13006, 18580, 22820, 26012, 32515, 65030, 130060, 151427, 302854, 605708, 757135, 1059989, 1514270, 2119978, 3028540, 4239956, 5299945, 10599890, 21199780]

約数ペア:

[(1, 21199780), (2, 10599890), (4, 5299945), (5, 4239956), (7, 3028540), (10, 2119978), (14, 1514270), (20, 1059989), (28, 757135), (35, 605708), (70, 302854), (140, 151427), (163, 130060), (326, 65030), (652, 32515), (815, 26012), (929, 22820), (1141, 18580), (1630, 13006), (1858, 11410), (2282, 9290), (3260, 6503), (3716, 5705), (4564, 4645)]