20506725534 has 16 divisors (see below), whose sum is σ = 41017656960. Its totient is φ = 6834874200.

The previous prime is 20506725529. The next prime is 20506725539. The reversal of 20506725534 is 43552760502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20506725529) and next prime (20506725539).

It is a junction number, because it is equal to n+sod(n) for n = 20506725492 and 20506725501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506725539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109992 + ... + 230459.

It is an arithmetic number, because the mean of its divisors is an integer number (2563603560).

Almost surely, 2^20506725534 is an apocalyptic number.

20506725534 is an abundant number, since it is smaller than the sum of its proper divisors (20510931426).

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

20506725534 is a wasteful number, since it uses less digits than its factorization.

20506725534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350495.

The product of its (nonzero) digits is 252000, while the sum is 39.

The spelling of 20506725534 in words is "twenty billion, five hundred six million, seven hundred twenty-five thousand, five hundred thirty-four".