19999820

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{997}}^1$

素因数の和:1082

約数の個数: 48

約数和(自身を含む): 45269280

約数和(自身を除く): 25269460

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 59, 68, 85, 118, 170, 236, 295, 340, 590, 997, 1003, 1180, 1994, 2006, 3988, 4012, 4985, 5015, 9970, 10030, 16949, 19940, 20060, 33898, 58823, 67796, 84745, 117646, 169490, 235292, 294115, 338980, 588230, 999991, 1176460, 1999982, 3999964, 4999955, 9999910, 19999820]

約数ペア:

[(1, 19999820), (2, 9999910), (4, 4999955), (5, 3999964), (10, 1999982), (17, 1176460), (20, 999991), (34, 588230), (59, 338980), (68, 294115), (85, 235292), (118, 169490), (170, 117646), (236, 84745), (295, 67796), (340, 58823), (590, 33898), (997, 20060), (1003, 19940), (1180, 16949), (1994, 10030), (2006, 9970), (3988, 5015), (4012, 4985)]