20978937

素因数分解:

$3^2\times 7^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:230

約数の個数: 48

約数和(自身を含む): 36211968

約数和(自身を除く): 15233031

約数列:

[1, 3, 7, 9, 21, 53, 61, 63, 103, 159, 183, 309, 371, 427, 477, 549, 721, 927, 1113, 1281, 2163, 3233, 3339, 3843, 5459, 6283, 6489, 9699, 16377, 18849, 22631, 29097, 38213, 43981, 49131, 56547, 67893, 114639, 131943, 203679, 332999, 343917, 395829, 998997, 2330993, 2996991, 6992979, 20978937]

約数ペア:

[(1, 20978937), (3, 6992979), (7, 2996991), (9, 2330993), (21, 998997), (53, 395829), (61, 343917), (63, 332999), (103, 203679), (159, 131943), (183, 114639), (309, 67893), (371, 56547), (427, 49131), (477, 43981), (549, 38213), (721, 29097), (927, 22631), (1113, 18849), (1281, 16377), (2163, 9699), (3233, 6489), (3339, 6283), (3843, 5459)]