21091960

素因数分解:

$2^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{6353}}^1$

素因数の和:6447

約数の個数: 32

約数和(自身を含む): 48036240

約数和(自身を除く): 26944280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 83, 166, 332, 415, 664, 830, 1660, 3320, 6353, 12706, 25412, 31765, 50824, 63530, 127060, 254120, 527299, 1054598, 2109196, 2636495, 4218392, 5272990, 10545980, 21091960]

約数ペア:

[(1, 21091960), (2, 10545980), (4, 5272990), (5, 4218392), (8, 2636495), (10, 2109196), (20, 1054598), (40, 527299), (83, 254120), (166, 127060), (332, 63530), (415, 50824), (664, 31765), (830, 25412), (1660, 12706), (3320, 6353)]