21272745

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^2\times {\mathrm{59}}^1$

素因数の和:166

約数の個数: 48

約数和(自身を含む): 38162880

約数和(自身を除く): 16890135

約数列:

[1, 3, 5, 13, 15, 39, 43, 59, 65, 129, 177, 195, 215, 295, 559, 645, 767, 885, 1677, 1849, 2301, 2537, 2795, 3835, 5547, 7611, 8385, 9245, 11505, 12685, 24037, 27735, 32981, 38055, 72111, 98943, 109091, 120185, 164905, 327273, 360555, 494715, 545455, 1418183, 1636365, 4254549, 7090915, 21272745]

約数ペア:

[(1, 21272745), (3, 7090915), (5, 4254549), (13, 1636365), (15, 1418183), (39, 545455), (43, 494715), (59, 360555), (65, 327273), (129, 164905), (177, 120185), (195, 109091), (215, 98943), (295, 72111), (559, 38055), (645, 32981), (767, 27735), (885, 24037), (1677, 12685), (1849, 11505), (2301, 9245), (2537, 8385), (2795, 7611), (3835, 5547)]