19971568

素因数分解:

$2^4\times {\mathrm{251}}^1\times {\mathrm{4973}}^1$

素因数の和:5232

約数の個数: 20

約数和(自身を含む): 38856888

約数和(自身を除く): 18885320

約数列:

[1, 2, 4, 8, 16, 251, 502, 1004, 2008, 4016, 4973, 9946, 19892, 39784, 79568, 1248223, 2496446, 4992892, 9985784, 19971568]

約数ペア:

[(1, 19971568), (2, 9985784), (4, 4992892), (8, 2496446), (16, 1248223), (251, 79568), (502, 39784), (1004, 19892), (2008, 9946), (4016, 4973)]