21504980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{153607}}^1$

素因数の和:153623

約数の個数: 24

約数和(自身を含む): 51612288

約数和(自身を除く): 30107308

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 153607, 307214, 614428, 768035, 1075249, 1536070, 2150498, 3072140, 4300996, 5376245, 10752490, 21504980]

約数ペア:

[(1, 21504980), (2, 10752490), (4, 5376245), (5, 4300996), (7, 3072140), (10, 2150498), (14, 1536070), (20, 1075249), (28, 768035), (35, 614428), (70, 307214), (140, 153607)]