21390988

素因数分解:

$2^2\times {\mathrm{79}}^1\times {\mathrm{139}}^1\times {\mathrm{487}}^1$

素因数の和:709

約数の個数: 24

約数和(自身を含む): 38259200

約数和(自身を除く): 16868212

約数列:

[1, 2, 4, 79, 139, 158, 278, 316, 487, 556, 974, 1948, 10981, 21962, 38473, 43924, 67693, 76946, 135386, 153892, 270772, 5347747, 10695494, 21390988]

約数ペア:

[(1, 21390988), (2, 10695494), (4, 5347747), (79, 270772), (139, 153892), (158, 135386), (278, 76946), (316, 67693), (487, 43924), (556, 38473), (974, 21962), (1948, 10981)]