991990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{227}}^1$

素因数の和:276

約数の個数: 32

約数和(自身を含む): 1969920

約数和(自身を除く): 977930

約数列:

[1, 2, 5, 10, 19, 23, 38, 46, 95, 115, 190, 227, 230, 437, 454, 874, 1135, 2185, 2270, 4313, 4370, 5221, 8626, 10442, 21565, 26105, 43130, 52210, 99199, 198398, 495995, 991990]

約数ペア:

[(1, 991990), (2, 495995), (5, 198398), (10, 99199), (19, 52210), (23, 43130), (38, 26105), (46, 21565), (95, 10442), (115, 8626), (190, 5221), (227, 4370), (230, 4313), (437, 2270), (454, 2185), (874, 1135)]