21781564

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{229}}^1$

素因数の和:362

約数の個数: 48

約数和(自身を含む): 45337600

約数和(自身を除く): 23556036

約数列:

[1, 2, 4, 7, 14, 28, 43, 79, 86, 158, 172, 229, 301, 316, 458, 553, 602, 916, 1106, 1204, 1603, 2212, 3206, 3397, 6412, 6794, 9847, 13588, 18091, 19694, 23779, 36182, 39388, 47558, 68929, 72364, 95116, 126637, 137858, 253274, 275716, 506548, 777913, 1555826, 3111652, 5445391, 10890782, 21781564]

約数ペア:

[(1, 21781564), (2, 10890782), (4, 5445391), (7, 3111652), (14, 1555826), (28, 777913), (43, 506548), (79, 275716), (86, 253274), (158, 137858), (172, 126637), (229, 95116), (301, 72364), (316, 68929), (458, 47558), (553, 39388), (602, 36182), (916, 23779), (1106, 19694), (1204, 18091), (1603, 13588), (2212, 9847), (3206, 6794), (3397, 6412)]