21640420

素因数分解:

$2^2\times 5^1\times {\mathrm{653}}^1\times {\mathrm{1657}}^1$

素因数の和:2319

約数の個数: 24

約数和(自身を含む): 45541944

約数和(自身を除く): 23901524

約数列:

[1, 2, 4, 5, 10, 20, 653, 1306, 1657, 2612, 3265, 3314, 6530, 6628, 8285, 13060, 16570, 33140, 1082021, 2164042, 4328084, 5410105, 10820210, 21640420]

約数ペア:

[(1, 21640420), (2, 10820210), (4, 5410105), (5, 4328084), (10, 2164042), (20, 1082021), (653, 33140), (1306, 16570), (1657, 13060), (2612, 8285), (3265, 6628), (3314, 6530)]