21906820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{773}}^1$

素因数の和:904

約数の個数: 48

約数和(自身を含む): 50062320

約数和(自身を除く): 28155500

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 109, 130, 218, 260, 436, 545, 773, 1090, 1417, 1546, 2180, 2834, 3092, 3865, 5668, 7085, 7730, 10049, 14170, 15460, 20098, 28340, 40196, 50245, 84257, 100490, 168514, 200980, 337028, 421285, 842570, 1095341, 1685140, 2190682, 4381364, 5476705, 10953410, 21906820]

約数ペア:

[(1, 21906820), (2, 10953410), (4, 5476705), (5, 4381364), (10, 2190682), (13, 1685140), (20, 1095341), (26, 842570), (52, 421285), (65, 337028), (109, 200980), (130, 168514), (218, 100490), (260, 84257), (436, 50245), (545, 40196), (773, 28340), (1090, 20098), (1417, 15460), (1546, 14170), (2180, 10049), (2834, 7730), (3092, 7085), (3865, 5668)]