20503157213 has 16 divisors (see below), whose sum is σ = 25567511424. Its totient is φ = 15973277760.

The previous prime is 20503157161. The next prime is 20503157221. The reversal of 20503157213 is 31275130502.

It is not a de Polignac number, because 20503157213 - 2⁶ = 20503157149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503157263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403931 + ... + 451847.

It is an arithmetic number, because the mean of its divisors is an integer number (1597969464).

Almost surely, 2^20503157213 is an apocalyptic number.

It is an amenable number.

20503157213 is a deficient number, since it is larger than the sum of its proper divisors (5064354211).

20503157213 is a wasteful number, since it uses less digits than its factorization.

20503157213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53492.

The product of its (nonzero) digits is 6300, while the sum is 29.

Adding to 20503157213 its reverse (31275130502), we get a palindrome (51778287715).

The spelling of 20503157213 in words is "twenty billion, five hundred three million, one hundred fifty-seven thousand, two hundred thirteen".