20749879 has 2 divisors, whose sum is σ = 20749880. Its totient is φ = 20749878.

The previous prime is 20749837. The next prime is 20749901. The reversal of 20749879 is 97894702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20749879 - 2¹⁹ = 20225591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20741879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374939 + 10374940.

It is an arithmetic number, because the mean of its divisors is an integer number (10374940).

Almost surely, 2^20749879 is an apocalyptic number.

20749879 is a deficient number, since it is larger than the sum of its proper divisors (1).

20749879 is an equidigital number, since it uses as much as digits as its factorization.

20749879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 20749879 is about 4555.2035080773. The cubic root of 20749879 is about 274.7926988675.

It can be divided in two parts, 207 and 49879, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 20749879 in words is "twenty million, seven hundred forty-nine thousand, eight hundred seventy-nine".