21741988

素因数分解:

$2^2\times {\mathrm{89}}^1\times {\mathrm{157}}^1\times {\mathrm{389}}^1$

素因数の和:639

約数の個数: 24

約数和(自身を含む): 38820600

約数和(自身を除く): 17078612

約数列:

[1, 2, 4, 89, 157, 178, 314, 356, 389, 628, 778, 1556, 13973, 27946, 34621, 55892, 61073, 69242, 122146, 138484, 244292, 5435497, 10870994, 21741988]

約数ペア:

[(1, 21741988), (2, 10870994), (4, 5435497), (89, 244292), (157, 138484), (178, 122146), (314, 69242), (356, 61073), (389, 55892), (628, 34621), (778, 27946), (1556, 13973)]