21020170

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67807}}^1$

素因数の和:67845

約数の個数: 16

約数和(自身を含む): 39057408

約数和(自身を除く): 18037238

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 67807, 135614, 339035, 678070, 2102017, 4204034, 10510085, 21020170]

約数ペア:

[(1, 21020170), (2, 10510085), (5, 4204034), (10, 2102017), (31, 678070), (62, 339035), (155, 135614), (310, 67807)]