21155980

素因数分解:

$2^2\times 5^1\times {\mathrm{947}}^1\times {\mathrm{1117}}^1$

素因数の和:2073

約数の個数: 24

約数和(自身を含む): 44514288

約数和(自身を除く): 23358308

約数列:

[1, 2, 4, 5, 10, 20, 947, 1117, 1894, 2234, 3788, 4468, 4735, 5585, 9470, 11170, 18940, 22340, 1057799, 2115598, 4231196, 5288995, 10577990, 21155980]

約数ペア:

[(1, 21155980), (2, 10577990), (4, 5288995), (5, 4231196), (10, 2115598), (20, 1057799), (947, 22340), (1117, 18940), (1894, 11170), (2234, 9470), (3788, 5585), (4468, 4735)]