21356120

素因数分解:

$2^3\times 5^1\times {\mathrm{331}}^1\times {\mathrm{1613}}^1$

素因数の和:1955

約数の個数: 32

約数和(自身を含む): 48226320

約数和(自身を除く): 26870200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 331, 662, 1324, 1613, 1655, 2648, 3226, 3310, 6452, 6620, 8065, 12904, 13240, 16130, 32260, 64520, 533903, 1067806, 2135612, 2669515, 4271224, 5339030, 10678060, 21356120]

約数ペア:

[(1, 21356120), (2, 10678060), (4, 5339030), (5, 4271224), (8, 2669515), (10, 2135612), (20, 1067806), (40, 533903), (331, 64520), (662, 32260), (1324, 16130), (1613, 13240), (1655, 12904), (2648, 8065), (3226, 6620), (3310, 6452)]