21781816

素因数分解:

$2^3\times 7^1\times {\mathrm{388961}}^1$

素因数の和:388974

約数の個数: 16

約数和(自身を含む): 46675440

約数和(自身を除く): 24893624

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 388961, 777922, 1555844, 2722727, 3111688, 5445454, 10890908, 21781816]

約数ペア:

[(1, 21781816), (2, 10890908), (4, 5445454), (7, 3111688), (8, 2722727), (14, 1555844), (28, 777922), (56, 388961)]