20813049 has 12 divisors (see below), whose sum is σ = 31831956. Its totient is φ = 13059072.

The previous prime is 20813041. The next prime is 20813063. The reversal of 20813049 is 94031802.

It can be written as a sum of positive squares in 2 ways, for example, as 6411024 + 14402025 = 2532^2 + 3795^2 .

It is not a de Polignac number, because 20813049 - 2³ = 20813041 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20813041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67864 + ... + 68169.

It is an arithmetic number, because the mean of its divisors is an integer number (2652663).

Almost surely, 2^20813049 is an apocalyptic number.

It is an amenable number.

20813049 is a deficient number, since it is larger than the sum of its proper divisors (11018907).

20813049 is a wasteful number, since it uses less digits than its factorization.

20813049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136056 (or 136053 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20813049 is about 4562.1320673562. The cubic root of 20813049 is about 275.0712718850.

The spelling of 20813049 in words is "twenty million, eight hundred thirteen thousand, forty-nine".