21318280

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8737}}^1$

素因数の和:8809

約数の個数: 32

約数和(自身を含む): 48758040

約数和(自身を除く): 27439760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8737, 17474, 34948, 43685, 69896, 87370, 174740, 349480, 532957, 1065914, 2131828, 2664785, 4263656, 5329570, 10659140, 21318280]

約数ペア:

[(1, 21318280), (2, 10659140), (4, 5329570), (5, 4263656), (8, 2664785), (10, 2131828), (20, 1065914), (40, 532957), (61, 349480), (122, 174740), (244, 87370), (305, 69896), (488, 43685), (610, 34948), (1220, 17474), (2440, 8737)]