21399490

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{347}}^1\times {\mathrm{881}}^1$

素因数の和:1242

約数の個数: 32

約数和(自身を含む): 44198784

約数和(自身を除く): 22799294

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 347, 694, 881, 1735, 1762, 2429, 3470, 4405, 4858, 6167, 8810, 12145, 12334, 24290, 30835, 61670, 305707, 611414, 1528535, 2139949, 3057070, 4279898, 10699745, 21399490]

約数ペア:

[(1, 21399490), (2, 10699745), (5, 4279898), (7, 3057070), (10, 2139949), (14, 1528535), (35, 611414), (70, 305707), (347, 61670), (694, 30835), (881, 24290), (1735, 12334), (1762, 12145), (2429, 8810), (3470, 6167), (4405, 4858)]