20513236207 has 8 divisors (see below), whose sum is σ = 21179354240. Its totient is φ = 19847393280.

The previous prime is 20513236189. The next prime is 20513236223. The reversal of 20513236207 is 70263231502.

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-20513236207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513230207) 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, 88519 + ... + 221047.

It is an arithmetic number, because the mean of its divisors is an integer number (2647419280).

Almost surely, 2^20513236207 is an apocalyptic number.

20513236207 is a deficient number, since it is larger than the sum of its proper divisors (666118033).

20513236207 is a wasteful number, since it uses less digits than its factorization.

20513236207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137553.

The product of its (nonzero) digits is 15120, while the sum is 31.

Adding to 20513236207 its reverse (70263231502), we get a palindrome (90776467709).

The spelling of 20513236207 in words is "twenty billion, five hundred thirteen million, two hundred thirty-six thousand, two hundred seven".