20857820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{131}}^1\times {\mathrm{419}}^1$

素因数の和:578

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25711780

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 131, 190, 262, 380, 419, 524, 655, 838, 1310, 1676, 2095, 2489, 2620, 4190, 4978, 7961, 8380, 9956, 12445, 15922, 24890, 31844, 39805, 49780, 54889, 79610, 109778, 159220, 219556, 274445, 548890, 1042891, 1097780, 2085782, 4171564, 5214455, 10428910, 20857820]

約数ペア:

[(1, 20857820), (2, 10428910), (4, 5214455), (5, 4171564), (10, 2085782), (19, 1097780), (20, 1042891), (38, 548890), (76, 274445), (95, 219556), (131, 159220), (190, 109778), (262, 79610), (380, 54889), (419, 49780), (524, 39805), (655, 31844), (838, 24890), (1310, 15922), (1676, 12445), (2095, 9956), (2489, 8380), (2620, 7961), (4190, 4978)]