20989917

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{173}}^1$

素因数の和:270

約数の個数: 48

約数和(自身を含む): 35341488

約数和(自身を除く): 14351571

約数列:

[1, 3, 9, 13, 17, 39, 51, 61, 117, 153, 173, 183, 221, 519, 549, 663, 793, 1037, 1557, 1989, 2249, 2379, 2941, 3111, 6747, 7137, 8823, 9333, 10553, 13481, 20241, 26469, 31659, 38233, 40443, 94977, 114699, 121329, 137189, 179401, 344097, 411567, 538203, 1234701, 1614609, 2332213, 6996639, 20989917]

約数ペア:

[(1, 20989917), (3, 6996639), (9, 2332213), (13, 1614609), (17, 1234701), (39, 538203), (51, 411567), (61, 344097), (117, 179401), (153, 137189), (173, 121329), (183, 114699), (221, 94977), (519, 40443), (549, 38233), (663, 31659), (793, 26469), (1037, 20241), (1557, 13481), (1989, 10553), (2249, 9333), (2379, 8823), (2941, 7137), (3111, 6747)]