21807812

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{8923}}^1$

素因数の和:8987

約数の個数: 24

約数和(自身を含む): 41978496

約数和(自身を除く): 20170684

約数列:

[1, 2, 4, 13, 26, 47, 52, 94, 188, 611, 1222, 2444, 8923, 17846, 35692, 115999, 231998, 419381, 463996, 838762, 1677524, 5451953, 10903906, 21807812]

約数ペア:

[(1, 21807812), (2, 10903906), (4, 5451953), (13, 1677524), (26, 838762), (47, 463996), (52, 419381), (94, 231998), (188, 115999), (611, 35692), (1222, 17846), (2444, 8923)]