20531203542 has 32 divisors (see below), whose sum is σ = 46737704160. Its totient is φ = 6676813440.

The previous prime is 20531203513. The next prime is 20531203591. The reversal of 20531203542 is 24530213502.

It is a happy number.

20531203542 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4634463 + ... + 4638890.

It is an arithmetic number, because the mean of its divisors is an integer number (1460553255).

Almost surely, 2^20531203542 is an apocalyptic number.

20531203542 is an abundant number, since it is smaller than the sum of its proper divisors (26206500618).

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

20531203542 is a wasteful number, since it uses less digits than its factorization.

20531203542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9273405 (or 9273399 counting only the distinct ones).

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

The spelling of 20531203542 in words is "twenty billion, five hundred thirty-one million, two hundred three thousand, five hundred forty-two".