21391713

素因数分解:

$3^2\times 7^1\times {\mathrm{457}}^1\times {\mathrm{743}}^1$

素因数の和:1213

約数の個数: 24

約数和(自身を含む): 35438208

約数和(自身を除く): 14046495

約数列:

[1, 3, 7, 9, 21, 63, 457, 743, 1371, 2229, 3199, 4113, 5201, 6687, 9597, 15603, 28791, 46809, 339551, 1018653, 2376857, 3055959, 7130571, 21391713]

約数ペア:

[(1, 21391713), (3, 7130571), (7, 3055959), (9, 2376857), (21, 1018653), (63, 339551), (457, 46809), (743, 28791), (1371, 15603), (2229, 9597), (3199, 6687), (4113, 5201)]