20491940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{743}}^1$

素因数の和:956

約数の個数: 48

約数和(自身を含む): 49496832

約数和(自身を除く): 29004892

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 197, 394, 743, 788, 985, 1379, 1486, 1970, 2758, 2972, 3715, 3940, 5201, 5516, 6895, 7430, 10402, 13790, 14860, 20804, 26005, 27580, 52010, 104020, 146371, 292742, 585484, 731855, 1024597, 1463710, 2049194, 2927420, 4098388, 5122985, 10245970, 20491940]

約数ペア:

[(1, 20491940), (2, 10245970), (4, 5122985), (5, 4098388), (7, 2927420), (10, 2049194), (14, 1463710), (20, 1024597), (28, 731855), (35, 585484), (70, 292742), (140, 146371), (197, 104020), (394, 52010), (743, 27580), (788, 26005), (985, 20804), (1379, 14860), (1486, 13790), (1970, 10402), (2758, 7430), (2972, 6895), (3715, 5516), (3940, 5201)]