19990120

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{7459}}^1$

素因数の和:7537

約数の個数: 32

約数和(自身を含む): 45655200

約数和(自身を除く): 25665080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 268, 335, 536, 670, 1340, 2680, 7459, 14918, 29836, 37295, 59672, 74590, 149180, 298360, 499753, 999506, 1999012, 2498765, 3998024, 4997530, 9995060, 19990120]

約数ペア:

[(1, 19990120), (2, 9995060), (4, 4997530), (5, 3998024), (8, 2498765), (10, 1999012), (20, 999506), (40, 499753), (67, 298360), (134, 149180), (268, 74590), (335, 59672), (536, 37295), (670, 29836), (1340, 14918), (2680, 7459)]