21491015

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{317}}^1$

素因数の和:491

約数の個数: 32

約数和(自身を含む): 32054400

約数和(自身を除く): 10563385

約数列:

[1, 5, 7, 13, 35, 65, 91, 149, 317, 455, 745, 1043, 1585, 1937, 2219, 4121, 5215, 9685, 11095, 13559, 20605, 28847, 47233, 67795, 144235, 236165, 330631, 614029, 1653155, 3070145, 4298203, 21491015]

約数ペア:

[(1, 21491015), (5, 4298203), (7, 3070145), (13, 1653155), (35, 614029), (65, 330631), (91, 236165), (149, 144235), (317, 67795), (455, 47233), (745, 28847), (1043, 20605), (1585, 13559), (1937, 11095), (2219, 9685), (4121, 5215)]