21180820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{401}}^1$

素因数の和:568

約数の個数: 48

約数和(自身を含む): 47275200

約数和(自身を除く): 26094380

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 139, 190, 278, 380, 401, 556, 695, 802, 1390, 1604, 2005, 2641, 2780, 4010, 5282, 7619, 8020, 10564, 13205, 15238, 26410, 30476, 38095, 52820, 55739, 76190, 111478, 152380, 222956, 278695, 557390, 1059041, 1114780, 2118082, 4236164, 5295205, 10590410, 21180820]

約数ペア:

[(1, 21180820), (2, 10590410), (4, 5295205), (5, 4236164), (10, 2118082), (19, 1114780), (20, 1059041), (38, 557390), (76, 278695), (95, 222956), (139, 152380), (190, 111478), (278, 76190), (380, 55739), (401, 52820), (556, 38095), (695, 30476), (802, 26410), (1390, 15238), (1604, 13205), (2005, 10564), (2641, 8020), (2780, 7619), (4010, 5282)]