20513249 has 8 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 20137600.

The previous prime is 20513231. The next prime is 20513257. The reversal of 20513249 is 94231502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20513249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20513299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21617 + ... + 22545.

It is an arithmetic number, because the mean of its divisors is an integer number (2611440).

Almost surely, 2^20513249 is an apocalyptic number.

It is an amenable number.

20513249 is a deficient number, since it is larger than the sum of its proper divisors (378271).

20513249 is an equidigital number, since it uses as much as digits as its factorization.

20513249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20513249 is about 4529.1554400352. The cubic root of 20513249 is about 273.7441312865.

The spelling of 20513249 in words is "twenty million, five hundred thirteen thousand, two hundred forty-nine".