21787912

素因数分解:

$2^3\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{431}}^1$

素因数の和:597

約数の個数: 32

約数和(自身を含む): 41990400

約数和(自身を除く): 20202488

約数列:

[1, 2, 4, 8, 71, 89, 142, 178, 284, 356, 431, 568, 712, 862, 1724, 3448, 6319, 12638, 25276, 30601, 38359, 50552, 61202, 76718, 122404, 153436, 244808, 306872, 2723489, 5446978, 10893956, 21787912]

約数ペア:

[(1, 21787912), (2, 10893956), (4, 5446978), (8, 2723489), (71, 306872), (89, 244808), (142, 153436), (178, 122404), (284, 76718), (356, 61202), (431, 50552), (568, 38359), (712, 30601), (862, 25276), (1724, 12638), (3448, 6319)]