20949759 has 24 divisors (see below), whose sum is σ = 31838352. Its totient is φ = 13763520.

The previous prime is 20949749. The next prime is 20949767. The reversal of 20949759 is 95794902.

It is not a de Polignac number, because 20949759 - 2⁴ = 20949743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17149 + ... + 18329.

It is an arithmetic number, because the mean of its divisors is an integer number (1326598).

Almost surely, 2^20949759 is an apocalyptic number.

20949759 is a deficient number, since it is larger than the sum of its proper divisors (10888593).

20949759 is an equidigital number, since it uses as much as digits as its factorization.

20949759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 20949759 is about 4577.0906698469. The cubic root of 20949759 is about 275.6722243115.

The spelling of 20949759 in words is "twenty million, nine hundred forty-nine thousand, seven hundred fifty-nine".