391489720

素因数分解:

$2^3\times 5^1\times {\mathrm{251}}^1\times {\mathrm{38993}}^1$

素因数の和:39255

約数の個数: 32

約数和(自身を含む): 884383920

約数和(自身を除く): 492894200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 251, 502, 1004, 1255, 2008, 2510, 5020, 10040, 38993, 77986, 155972, 194965, 311944, 389930, 779860, 1559720, 9787243, 19574486, 39148972, 48936215, 78297944, 97872430, 195744860, 391489720]

約数ペア:

[(1, 391489720), (2, 195744860), (4, 97872430), (5, 78297944), (8, 48936215), (10, 39148972), (20, 19574486), (40, 9787243), (251, 1559720), (502, 779860), (1004, 389930), (1255, 311944), (2008, 194965), (2510, 155972), (5020, 77986), (10040, 38993)]