21188655

素因数分解:

$3^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{83}}^1$

素因数の和:189

約数の個数: 64

約数和(自身を含む): 39997440

約数和(自身を除く): 18808785

約数列:

[1, 3, 5, 9, 15, 27, 31, 45, 61, 83, 93, 135, 155, 183, 249, 279, 305, 415, 465, 549, 747, 837, 915, 1245, 1395, 1647, 1891, 2241, 2573, 2745, 3735, 4185, 5063, 5673, 7719, 8235, 9455, 11205, 12865, 15189, 17019, 23157, 25315, 28365, 38595, 45567, 51057, 69471, 75945, 85095, 115785, 136701, 156953, 227835, 255285, 347355, 470859, 683505, 784765, 1412577, 2354295, 4237731, 7062885, 21188655]

約数ペア:

[(1, 21188655), (3, 7062885), (5, 4237731), (9, 2354295), (15, 1412577), (27, 784765), (31, 683505), (45, 470859), (61, 347355), (83, 255285), (93, 227835), (135, 156953), (155, 136701), (183, 115785), (249, 85095), (279, 75945), (305, 69471), (415, 51057), (465, 45567), (549, 38595), (747, 28365), (837, 25315), (915, 23157), (1245, 17019), (1395, 15189), (1647, 12865), (1891, 11205), (2241, 9455), (2573, 8235), (2745, 7719), (3735, 5673), (4185, 5063)]