21328040

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8741}}^1$

素因数の和:8813

約数の個数: 32

約数和(自身を含む): 48780360

約数和(自身を除く): 27452320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8741, 17482, 34964, 43705, 69928, 87410, 174820, 349640, 533201, 1066402, 2132804, 2666005, 4265608, 5332010, 10664020, 21328040]

約数ペア:

[(1, 21328040), (2, 10664020), (4, 5332010), (5, 4265608), (8, 2666005), (10, 2132804), (20, 1066402), (40, 533201), (61, 349640), (122, 174820), (244, 87410), (305, 69928), (488, 43705), (610, 34964), (1220, 17482), (2440, 8741)]