20545020031 has 4 divisors (see below), whose sum is σ = 20737029672. Its totient is φ = 20353010392.

The previous prime is 20545019981. The next prime is 20545020037. The reversal of 20545020031 is 13002054502.

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 20545020031 - 2⁹ = 20545019519 is a prime.

It is a super-2 number, since 2×20545020031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20545019984 and 20545020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545020037) 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, 96004660 + ... + 96004873.

It is an arithmetic number, because the mean of its divisors is an integer number (5184257418).

Almost surely, 2^20545020031 is an apocalyptic number.

20545020031 is a deficient number, since it is larger than the sum of its proper divisors (192009641).

20545020031 is a wasteful number, since it uses less digits than its factorization.

20545020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192009640.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20545020031 its reverse (13002054502), we get a palindrome (33547074533).

The spelling of 20545020031 in words is "twenty billion, five hundred forty-five million, twenty thousand, thirty-one".