21218992

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{181}}^1\times {\mathrm{431}}^1$

素因数の和:637

約数の個数: 40

約数和(自身を含む): 43872192

約数和(自身を除く): 22653200

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 181, 272, 362, 431, 724, 862, 1448, 1724, 2896, 3077, 3448, 6154, 6896, 7327, 12308, 14654, 24616, 29308, 49232, 58616, 78011, 117232, 156022, 312044, 624088, 1248176, 1326187, 2652374, 5304748, 10609496, 21218992]

約数ペア:

[(1, 21218992), (2, 10609496), (4, 5304748), (8, 2652374), (16, 1326187), (17, 1248176), (34, 624088), (68, 312044), (136, 156022), (181, 117232), (272, 78011), (362, 58616), (431, 49232), (724, 29308), (862, 24616), (1448, 14654), (1724, 12308), (2896, 7327), (3077, 6896), (3448, 6154)]