21658180

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{197}}^1\times {\mathrm{239}}^1$

素因数の和:468

約数の個数: 48

約数和(自身を含む): 47900160

約数和(自身を除く): 26241980

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 115, 197, 230, 239, 394, 460, 478, 788, 956, 985, 1195, 1970, 2390, 3940, 4531, 4780, 5497, 9062, 10994, 18124, 21988, 22655, 27485, 45310, 47083, 54970, 90620, 94166, 109940, 188332, 235415, 470830, 941660, 1082909, 2165818, 4331636, 5414545, 10829090, 21658180]

約数ペア:

[(1, 21658180), (2, 10829090), (4, 5414545), (5, 4331636), (10, 2165818), (20, 1082909), (23, 941660), (46, 470830), (92, 235415), (115, 188332), (197, 109940), (230, 94166), (239, 90620), (394, 54970), (460, 47083), (478, 45310), (788, 27485), (956, 22655), (985, 21988), (1195, 18124), (1970, 10994), (2390, 9062), (3940, 5497), (4531, 4780)]