21257235

素因数分解:

$3^4\times 5^1\times {\mathrm{73}}^1\times {\mathrm{719}}^1$

素因数の和:809

約数の個数: 40

約数和(自身を含む): 38681280

約数和(自身を除く): 17424045

約数列:

[1, 3, 5, 9, 15, 27, 45, 73, 81, 135, 219, 365, 405, 657, 719, 1095, 1971, 2157, 3285, 3595, 5913, 6471, 9855, 10785, 19413, 29565, 32355, 52487, 58239, 97065, 157461, 262435, 291195, 472383, 787305, 1417149, 2361915, 4251447, 7085745, 21257235]

約数ペア:

[(1, 21257235), (3, 7085745), (5, 4251447), (9, 2361915), (15, 1417149), (27, 787305), (45, 472383), (73, 291195), (81, 262435), (135, 157461), (219, 97065), (365, 58239), (405, 52487), (657, 32355), (719, 29565), (1095, 19413), (1971, 10785), (2157, 9855), (3285, 6471), (3595, 5913)]