21215236

素因数分解:

$2^2\times 7^4\times {\mathrm{47}}^2$

素因数の和:126

約数の個数: 45

約数和(自身を含む): 44252999

約数和(自身を除く): 23037763

約数列:

[1, 2, 4, 7, 14, 28, 47, 49, 94, 98, 188, 196, 329, 343, 658, 686, 1316, 1372, 2209, 2303, 2401, 4418, 4606, 4802, 8836, 9212, 9604, 15463, 16121, 30926, 32242, 61852, 64484, 108241, 112847, 216482, 225694, 432964, 451388, 757687, 1515374, 3030748, 5303809, 10607618, 21215236]

約数ペア:

[(1, 21215236), (2, 10607618), (4, 5303809), (7, 3030748), (14, 1515374), (28, 757687), (47, 451388), (49, 432964), (94, 225694), (98, 216482), (188, 112847), (196, 108241), (329, 64484), (343, 61852), (658, 32242), (686, 30926), (1316, 16121), (1372, 15463), (2209, 9604), (2303, 9212), (2401, 8836), (4418, 4802)]