21205107

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{827}}^1$

素因数の和:888

約数の個数: 48

約数和(自身を含む): 39267072

約数和(自身を除く): 18061965

約数列:

[1, 3, 7, 9, 11, 21, 33, 37, 63, 77, 99, 111, 231, 259, 333, 407, 693, 777, 827, 1221, 2331, 2481, 2849, 3663, 5789, 7443, 8547, 9097, 17367, 25641, 27291, 30599, 52101, 63679, 81873, 91797, 191037, 214193, 275391, 336589, 573111, 642579, 1009767, 1927737, 2356123, 3029301, 7068369, 21205107]

約数ペア:

[(1, 21205107), (3, 7068369), (7, 3029301), (9, 2356123), (11, 1927737), (21, 1009767), (33, 642579), (37, 573111), (63, 336589), (77, 275391), (99, 214193), (111, 191037), (231, 91797), (259, 81873), (333, 63679), (407, 52101), (693, 30599), (777, 27291), (827, 25641), (1221, 17367), (2331, 9097), (2481, 8547), (2849, 7443), (3663, 5789)]