20050223531 has 4 divisors (see below), whose sum is σ = 21592548432. Its totient is φ = 18507898632.

The previous prime is 20050223519. The next prime is 20050223533. The reversal of 20050223531 is 13532205002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20050223531 - 2¹⁸ = 20049961387 is a prime.

It is a super-2 number, since 2×20050223531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20050223497 and 20050223506.

It is not an unprimeable number, because it can be changed into a prime (20050223533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771162431 + ... + 771162456.

It is an arithmetic number, because the mean of its divisors is an integer number (5398137108).

Almost surely, 2^20050223531 is an apocalyptic number.

20050223531 is a deficient number, since it is larger than the sum of its proper divisors (1542324901).

20050223531 is a wasteful number, since it uses less digits than its factorization.

20050223531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542324900.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 20050223531 its reverse (13532205002), we get a palindrome (33582428533).

The spelling of 20050223531 in words is "twenty billion, fifty million, two hundred twenty-three thousand, five hundred thirty-one".