21081008

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{2357}}^1$

素因数の和:2421

約数の個数: 40

約数和(自身を含む): 45028368

約数和(自身を除く): 23947360

約数列:

[1, 2, 4, 8, 13, 16, 26, 43, 52, 86, 104, 172, 208, 344, 559, 688, 1118, 2236, 2357, 4472, 4714, 8944, 9428, 18856, 30641, 37712, 61282, 101351, 122564, 202702, 245128, 405404, 490256, 810808, 1317563, 1621616, 2635126, 5270252, 10540504, 21081008]

約数ペア:

[(1, 21081008), (2, 10540504), (4, 5270252), (8, 2635126), (13, 1621616), (16, 1317563), (26, 810808), (43, 490256), (52, 405404), (86, 245128), (104, 202702), (172, 122564), (208, 101351), (344, 61282), (559, 37712), (688, 30641), (1118, 18856), (2236, 9428), (2357, 8944), (4472, 4714)]