20450431542 has 32 divisors (see below), whose sum is σ = 42391720800. Its totient is φ = 6571715328.

The previous prime is 20450431523. The next prime is 20450431549. The reversal of 20450431542 is 24513405402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450431549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398367 + ... + 446762.

It is an arithmetic number, because the mean of its divisors is an integer number (1324741275).

Almost surely, 2^20450431542 is an apocalyptic number.

20450431542 is an abundant number, since it is smaller than the sum of its proper divisors (21941289258).

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

20450431542 is a wasteful number, since it uses less digits than its factorization.

20450431542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845280.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20450431542 its reverse (24513405402), we get a palindrome (44963836944).

The spelling of 20450431542 in words is "twenty billion, four hundred fifty million, four hundred thirty-one thousand, five hundred forty-two".