21315980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{21751}}^1$

素因数の和:21774

約数の個数: 36

約数和(自身を含む): 52074288

約数和(自身を除く): 30758308

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21751, 43502, 87004, 108755, 152257, 217510, 304514, 435020, 609028, 761285, 1065799, 1522570, 2131598, 3045140, 4263196, 5328995, 10657990, 21315980]

約数ペア:

[(1, 21315980), (2, 10657990), (4, 5328995), (5, 4263196), (7, 3045140), (10, 2131598), (14, 1522570), (20, 1065799), (28, 761285), (35, 609028), (49, 435020), (70, 304514), (98, 217510), (140, 152257), (196, 108755), (245, 87004), (490, 43502), (980, 21751)]