20624431082 has 4 divisors (see below), whose sum is σ = 30936646626. Its totient is φ = 10312215540.

The previous prime is 20624431081. The next prime is 20624431103. The reversal of 20624431082 is 28013442602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28013442602 = 2 ⋅14006721301.

It can be written as a sum of positive squares in only one way, i.e., 11833305961 + 8791125121 = 108781^2 + 93761^2 .

It is not an unprimeable number, because it can be changed into a prime (20624431081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5156107769 + ... + 5156107772.

Almost surely, 2^20624431082 is an apocalyptic number.

20624431082 is a deficient number, since it is larger than the sum of its proper divisors (10312215544).

20624431082 is a wasteful number, since it uses less digits than its factorization.

20624431082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312215543.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 20624431082 its reverse (28013442602), we get a palindrome (48637873684).

The spelling of 20624431082 in words is "twenty billion, six hundred twenty-four million, four hundred thirty-one thousand, eighty-two".