18972980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{72973}}^1$

素因数の和:72995

約数の個数: 24

約数和(自身を含む): 42908712

約数和(自身を除く): 23935732

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 72973, 145946, 291892, 364865, 729730, 948649, 1459460, 1897298, 3794596, 4743245, 9486490, 18972980]

約数ペア:

[(1, 18972980), (2, 9486490), (4, 4743245), (5, 3794596), (10, 1897298), (13, 1459460), (20, 948649), (26, 729730), (52, 364865), (65, 291892), (130, 145946), (260, 72973)]