21296560

素因数分解:

$2^4\times 5^1\times {\mathrm{509}}^1\times {\mathrm{523}}^1$

素因数の和:1045

約数の個数: 40

約数和(自身を含む): 49706640

約数和(自身を除く): 28410080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 509, 523, 1018, 1046, 2036, 2092, 2545, 2615, 4072, 4184, 5090, 5230, 8144, 8368, 10180, 10460, 20360, 20920, 40720, 41840, 266207, 532414, 1064828, 1331035, 2129656, 2662070, 4259312, 5324140, 10648280, 21296560]

約数ペア:

[(1, 21296560), (2, 10648280), (4, 5324140), (5, 4259312), (8, 2662070), (10, 2129656), (16, 1331035), (20, 1064828), (40, 532414), (80, 266207), (509, 41840), (523, 40720), (1018, 20920), (1046, 20360), (2036, 10460), (2092, 10180), (2545, 8368), (2615, 8144), (4072, 5230), (4184, 5090)]