21347375

素因数分解:

$5^3\times 7^1\times {\mathrm{31}}^1\times {\mathrm{787}}^1$

素因数の和:840

約数の個数: 32

約数和(自身を含む): 31469568

約数和(自身を除く): 10122193

約数列:

[1, 5, 7, 25, 31, 35, 125, 155, 175, 217, 775, 787, 875, 1085, 3875, 3935, 5425, 5509, 19675, 24397, 27125, 27545, 98375, 121985, 137725, 170779, 609925, 688625, 853895, 3049625, 4269475, 21347375]

約数ペア:

[(1, 21347375), (5, 4269475), (7, 3049625), (25, 853895), (31, 688625), (35, 609925), (125, 170779), (155, 137725), (175, 121985), (217, 98375), (775, 27545), (787, 27125), (875, 24397), (1085, 19675), (3875, 5509), (3935, 5425)]