21218420

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{193}}^1\times {\mathrm{239}}^1$

素因数の和:464

約数の個数: 48

約数和(自身を含む): 46932480

約数和(自身を除く): 25714060

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 115, 193, 230, 239, 386, 460, 478, 772, 956, 965, 1195, 1930, 2390, 3860, 4439, 4780, 5497, 8878, 10994, 17756, 21988, 22195, 27485, 44390, 46127, 54970, 88780, 92254, 109940, 184508, 230635, 461270, 922540, 1060921, 2121842, 4243684, 5304605, 10609210, 21218420]

約数ペア:

[(1, 21218420), (2, 10609210), (4, 5304605), (5, 4243684), (10, 2121842), (20, 1060921), (23, 922540), (46, 461270), (92, 230635), (115, 184508), (193, 109940), (230, 92254), (239, 88780), (386, 54970), (460, 46127), (478, 44390), (772, 27485), (956, 22195), (965, 21988), (1195, 17756), (1930, 10994), (2390, 8878), (3860, 5497), (4439, 4780)]