20531321442 has 12 divisors (see below), whose sum is σ = 44484529830. Its totient is φ = 6843773808.

The previous prime is 20531321399. The next prime is 20531321453. The reversal of 20531321442 is 24412313502.

20531321442 is a `hidden beast` number, since 205 + 3 + 13 + 2 + 1 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19390841001 + 1140480441 = 139251^2 + 33771^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570314467 + ... + 570314502.

Almost surely, 2^20531321442 is an apocalyptic number.

20531321442 is an abundant number, since it is smaller than the sum of its proper divisors (23953208388).

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

20531321442 is a wasteful number, since it uses less digits than its factorization.

20531321442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140628977 (or 1140628974 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20531321442 its reverse (24412313502), we get a palindrome (44943634944).

The spelling of 20531321442 in words is "twenty billion, five hundred thirty-one million, three hundred twenty-one thousand, four hundred forty-two".