20999538

素因数分解:

$2^1\times 3^2\times 7^2\times {\mathrm{29}}^1\times {\mathrm{821}}^1$

素因数の和:872

約数の個数: 72

約数和(自身を含む): 54819180

約数和(自身を除く): 33819642

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 29, 42, 49, 58, 63, 87, 98, 126, 147, 174, 203, 261, 294, 406, 441, 522, 609, 821, 882, 1218, 1421, 1642, 1827, 2463, 2842, 3654, 4263, 4926, 5747, 7389, 8526, 11494, 12789, 14778, 17241, 23809, 25578, 34482, 40229, 47618, 51723, 71427, 80458, 103446, 120687, 142854, 166663, 214281, 241374, 333326, 362061, 428562, 499989, 724122, 999978, 1166641, 1499967, 2333282, 2999934, 3499923, 6999846, 10499769, 20999538]

約数ペア:

[(1, 20999538), (2, 10499769), (3, 6999846), (6, 3499923), (7, 2999934), (9, 2333282), (14, 1499967), (18, 1166641), (21, 999978), (29, 724122), (42, 499989), (49, 428562), (58, 362061), (63, 333326), (87, 241374), (98, 214281), (126, 166663), (147, 142854), (174, 120687), (203, 103446), (261, 80458), (294, 71427), (406, 51723), (441, 47618), (522, 40229), (609, 34482), (821, 25578), (882, 23809), (1218, 17241), (1421, 14778), (1642, 12789), (1827, 11494), (2463, 8526), (2842, 7389), (3654, 5747), (4263, 4926)]