21519220

素因数分解:

$2^2\times 5^1\times {\mathrm{647}}^1\times {\mathrm{1663}}^1$

素因数の和:2319

約数の個数: 24

約数和(自身を含む): 45287424

約数和(自身を除く): 23768204

約数列:

[1, 2, 4, 5, 10, 20, 647, 1294, 1663, 2588, 3235, 3326, 6470, 6652, 8315, 12940, 16630, 33260, 1075961, 2151922, 4303844, 5379805, 10759610, 21519220]

約数ペア:

[(1, 21519220), (2, 10759610), (4, 5379805), (5, 4303844), (10, 2151922), (20, 1075961), (647, 33260), (1294, 16630), (1663, 12940), (2588, 8315), (3235, 6652), (3326, 6470)]