640240

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{151}}^1$

素因数の和:217

約数の個数: 40

約数和(自身を含む): 1526688

約数和(自身を除く): 886448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 106, 151, 212, 265, 302, 424, 530, 604, 755, 848, 1060, 1208, 1510, 2120, 2416, 3020, 4240, 6040, 8003, 12080, 16006, 32012, 40015, 64024, 80030, 128048, 160060, 320120, 640240]

約数ペア:

[(1, 640240), (2, 320120), (4, 160060), (5, 128048), (8, 80030), (10, 64024), (16, 40015), (20, 32012), (40, 16006), (53, 12080), (80, 8003), (106, 6040), (151, 4240), (212, 3020), (265, 2416), (302, 2120), (424, 1510), (530, 1208), (604, 1060), (755, 848)]