21993040

素因数分解:

$2^4\times 5^1\times {\mathrm{421}}^1\times {\mathrm{653}}^1$

素因数の和:1087

約数の個数: 40

約数和(自身を含む): 51333768

約数和(自身を除く): 29340728

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 421, 653, 842, 1306, 1684, 2105, 2612, 3265, 3368, 4210, 5224, 6530, 6736, 8420, 10448, 13060, 16840, 26120, 33680, 52240, 274913, 549826, 1099652, 1374565, 2199304, 2749130, 4398608, 5498260, 10996520, 21993040]

約数ペア:

[(1, 21993040), (2, 10996520), (4, 5498260), (5, 4398608), (8, 2749130), (10, 2199304), (16, 1374565), (20, 1099652), (40, 549826), (80, 274913), (421, 52240), (653, 33680), (842, 26120), (1306, 16840), (1684, 13060), (2105, 10448), (2612, 8420), (3265, 6736), (3368, 6530), (4210, 5224)]