21490120

素因数分解:

$2^3\times 5^1\times {\mathrm{727}}^1\times {\mathrm{739}}^1$

素因数の和:1477

約数の個数: 32

約数和(自身を含む): 48484800

約数和(自身を除く): 26994680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 727, 739, 1454, 1478, 2908, 2956, 3635, 3695, 5816, 5912, 7270, 7390, 14540, 14780, 29080, 29560, 537253, 1074506, 2149012, 2686265, 4298024, 5372530, 10745060, 21490120]

約数ペア:

[(1, 21490120), (2, 10745060), (4, 5372530), (5, 4298024), (8, 2686265), (10, 2149012), (20, 1074506), (40, 537253), (727, 29560), (739, 29080), (1454, 14780), (1478, 14540), (2908, 7390), (2956, 7270), (3635, 5912), (3695, 5816)]