20056643503 has 16 divisors (see below), whose sum is σ = 22905529920. Its totient is φ = 17397720576.

The previous prime is 20056643491. The next prime is 20056643521. The reversal of 20056643503 is 30534665002.

It is not a de Polignac number, because 20056643503 - 2¹³ = 20056635311 is a prime.

It is a super-2 number, since 2×20056643503² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20056640503) 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, 72853 + ... + 213121.

It is an arithmetic number, because the mean of its divisors is an integer number (1431595620).

Almost surely, 2^20056643503 is an apocalyptic number.

20056643503 is a deficient number, since it is larger than the sum of its proper divisors (2848886417).

20056643503 is a wasteful number, since it uses less digits than its factorization.

20056643503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140946.

The product of its (nonzero) digits is 64800, while the sum is 34.

The spelling of 20056643503 in words is "twenty billion, fifty-six million, six hundred forty-three thousand, five hundred three".