21221668

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31393}}^1$

素因数の和:31423

約数の個数: 18

約数和(自身を含む): 40215714

約数和(自身を除く): 18994046

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31393, 62786, 125572, 408109, 816218, 1632436, 5305417, 10610834, 21221668]

約数ペア:

[(1, 21221668), (2, 10610834), (4, 5305417), (13, 1632436), (26, 816218), (52, 408109), (169, 125572), (338, 62786), (676, 31393)]