20739280

素因数分解:

$2^4\times 5^1\times {\mathrm{397}}^1\times {\mathrm{653}}^1$

素因数の和:1063

約数の個数: 40

約数和(自身を含む): 48414312

約数和(自身を除く): 27675032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 397, 653, 794, 1306, 1588, 1985, 2612, 3176, 3265, 3970, 5224, 6352, 6530, 7940, 10448, 13060, 15880, 26120, 31760, 52240, 259241, 518482, 1036964, 1296205, 2073928, 2592410, 4147856, 5184820, 10369640, 20739280]

約数ペア:

[(1, 20739280), (2, 10369640), (4, 5184820), (5, 4147856), (8, 2592410), (10, 2073928), (16, 1296205), (20, 1036964), (40, 518482), (80, 259241), (397, 52240), (653, 31760), (794, 26120), (1306, 15880), (1588, 13060), (1985, 10448), (2612, 7940), (3176, 6530), (3265, 6352), (3970, 5224)]