21256420

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{67}}^1\times {\mathrm{547}}^1$

素因数の和:652

約数の個数: 48

約数和(自身を含む): 46952640

約数和(自身を除く): 25696220

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 67, 116, 134, 145, 268, 290, 335, 547, 580, 670, 1094, 1340, 1943, 2188, 2735, 3886, 5470, 7772, 9715, 10940, 15863, 19430, 31726, 36649, 38860, 63452, 73298, 79315, 146596, 158630, 183245, 317260, 366490, 732980, 1062821, 2125642, 4251284, 5314105, 10628210, 21256420]

約数ペア:

[(1, 21256420), (2, 10628210), (4, 5314105), (5, 4251284), (10, 2125642), (20, 1062821), (29, 732980), (58, 366490), (67, 317260), (116, 183245), (134, 158630), (145, 146596), (268, 79315), (290, 73298), (335, 63452), (547, 38860), (580, 36649), (670, 31726), (1094, 19430), (1340, 15863), (1943, 10940), (2188, 9715), (2735, 7772), (3886, 5470)]