21981987

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{719}}^1$

素因数の和:847

約数の個数: 24

約数和(自身を含む): 32947200

約数和(自身を除く): 10965213

約数列:

[1, 3, 9, 43, 79, 129, 237, 387, 711, 719, 2157, 3397, 6471, 10191, 30573, 30917, 56801, 92751, 170403, 278253, 511209, 2442443, 7327329, 21981987]

約数ペア:

[(1, 21981987), (3, 7327329), (9, 2442443), (43, 511209), (79, 278253), (129, 170403), (237, 92751), (387, 56801), (711, 30917), (719, 30573), (2157, 10191), (3397, 6471)]