21115720

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{7879}}^1$

素因数の和:7957

約数の個数: 32

約数和(自身を含む): 48225600

約数和(自身を除く): 27109880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 268, 335, 536, 670, 1340, 2680, 7879, 15758, 31516, 39395, 63032, 78790, 157580, 315160, 527893, 1055786, 2111572, 2639465, 4223144, 5278930, 10557860, 21115720]

約数ペア:

[(1, 21115720), (2, 10557860), (4, 5278930), (5, 4223144), (8, 2639465), (10, 2111572), (20, 1055786), (40, 527893), (67, 315160), (134, 157580), (268, 78790), (335, 63032), (536, 39395), (670, 31516), (1340, 15758), (2680, 7879)]