20531022534 has 80 divisors (see below), whose sum is σ = 50315093136. Its totient is φ = 6205636800.

The previous prime is 20531022529. The next prime is 20531022539. The reversal of 20531022534 is 43522013502.

It is a happy number.

20531022534 is a `hidden beast` number, since 20 + 5 + 3 + 102 + 2 + 534 = 666.

It is an interprime number because it is at equal distance from previous prime (20531022529) and next prime (20531022539).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20531022498 and 20531022507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531022539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 692944 + ... + 721964.

Almost surely, 2^20531022534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531022534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25157546568).

20531022534 is an abundant number, since it is smaller than the sum of its proper divisors (29784070602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20531022534 is a wasteful number, since it uses less digits than its factorization.

20531022534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29443 (or 29434 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 20531022534 in words is "twenty billion, five hundred thirty-one million, twenty-two thousand, five hundred thirty-four".