20870775

素因数分解:

$3^2\times 5^2\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1$

素因数の和:185

約数の個数: 72

約数和(自身を含む): 40428960

約数和(自身を除く): 19558185

約数列:

[1, 3, 5, 9, 15, 23, 25, 37, 45, 69, 75, 109, 111, 115, 185, 207, 225, 327, 333, 345, 545, 555, 575, 851, 925, 981, 1035, 1635, 1665, 1725, 2507, 2553, 2725, 2775, 4033, 4255, 4905, 5175, 7521, 7659, 8175, 8325, 12099, 12535, 12765, 20165, 21275, 22563, 24525, 36297, 37605, 38295, 60495, 62675, 63825, 92759, 100825, 112815, 181485, 188025, 191475, 278277, 302475, 463795, 564075, 834831, 907425, 1391385, 2318975, 4174155, 6956925, 20870775]

約数ペア:

[(1, 20870775), (3, 6956925), (5, 4174155), (9, 2318975), (15, 1391385), (23, 907425), (25, 834831), (37, 564075), (45, 463795), (69, 302475), (75, 278277), (109, 191475), (111, 188025), (115, 181485), (185, 112815), (207, 100825), (225, 92759), (327, 63825), (333, 62675), (345, 60495), (545, 38295), (555, 37605), (575, 36297), (851, 24525), (925, 22563), (981, 21275), (1035, 20165), (1635, 12765), (1665, 12535), (1725, 12099), (2507, 8325), (2553, 8175), (2725, 7659), (2775, 7521), (4033, 5175), (4255, 4905)]