20897120

素因数分解:

$2^5\times 5^1\times {\mathrm{131}}^1\times {\mathrm{997}}^1$

素因数の和:1143

約数の個数: 48

約数和(自身を含む): 49796208

約数和(自身を除く): 28899088

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 131, 160, 262, 524, 655, 997, 1048, 1310, 1994, 2096, 2620, 3988, 4192, 4985, 5240, 7976, 9970, 10480, 15952, 19940, 20960, 31904, 39880, 79760, 130607, 159520, 261214, 522428, 653035, 1044856, 1306070, 2089712, 2612140, 4179424, 5224280, 10448560, 20897120]

約数ペア:

[(1, 20897120), (2, 10448560), (4, 5224280), (5, 4179424), (8, 2612140), (10, 2089712), (16, 1306070), (20, 1044856), (32, 653035), (40, 522428), (80, 261214), (131, 159520), (160, 130607), (262, 79760), (524, 39880), (655, 31904), (997, 20960), (1048, 19940), (1310, 15952), (1994, 10480), (2096, 9970), (2620, 7976), (3988, 5240), (4192, 4985)]