19992920

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1259}}^1$

素因数の和:1667

約数の個数: 32

約数和(自身を含む): 45133200

約数和(自身を除く): 25140280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1259, 1588, 1985, 2518, 3176, 3970, 5036, 6295, 7940, 10072, 12590, 15880, 25180, 50360, 499823, 999646, 1999292, 2499115, 3998584, 4998230, 9996460, 19992920]

約数ペア:

[(1, 19992920), (2, 9996460), (4, 4998230), (5, 3998584), (8, 2499115), (10, 1999292), (20, 999646), (40, 499823), (397, 50360), (794, 25180), (1259, 15880), (1588, 12590), (1985, 10072), (2518, 7940), (3176, 6295), (3970, 5036)]