21665553

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1301}}^1$

素因数の和:1385

約数の個数: 32

約数和(自身を含む): 36164352

約数和(自身を除く): 14498799

約数列:

[1, 3, 7, 13, 21, 39, 61, 91, 183, 273, 427, 793, 1281, 1301, 2379, 3903, 5551, 9107, 16653, 16913, 27321, 50739, 79361, 118391, 238083, 355173, 555527, 1031693, 1666581, 3095079, 7221851, 21665553]

約数ペア:

[(1, 21665553), (3, 7221851), (7, 3095079), (13, 1666581), (21, 1031693), (39, 555527), (61, 355173), (91, 238083), (183, 118391), (273, 79361), (427, 50739), (793, 27321), (1281, 16913), (1301, 16653), (2379, 9107), (3903, 5551)]