20897680

素因数分解:

$2^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{2693}}^1$

素因数の和:2803

約数の個数: 40

約数和(自身を含む): 49106232

約数和(自身を除く): 28208552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 2693, 3880, 5386, 7760, 10772, 13465, 21544, 26930, 43088, 53860, 107720, 215440, 261221, 522442, 1044884, 1306105, 2089768, 2612210, 4179536, 5224420, 10448840, 20897680]

約数ペア:

[(1, 20897680), (2, 10448840), (4, 5224420), (5, 4179536), (8, 2612210), (10, 2089768), (16, 1306105), (20, 1044884), (40, 522442), (80, 261221), (97, 215440), (194, 107720), (388, 53860), (485, 43088), (776, 26930), (970, 21544), (1552, 13465), (1940, 10772), (2693, 7760), (3880, 5386)]