20512400432 has 10 divisors (see below), whose sum is σ = 39742775868. Its totient is φ = 10256200208.

The previous prime is 20512400423. The next prime is 20512400471. The reversal of 20512400432 is 23400421502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20512400398 and 20512400407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641012498 + ... + 641012529.

Almost surely, 2^20512400432 is an apocalyptic number.

It is an amenable number.

20512400432 is a deficient number, since it is larger than the sum of its proper divisors (19230375436).

20512400432 is a wasteful number, since it uses less digits than its factorization.

20512400432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282025035 (or 1282025029 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 20512400432 its reverse (23400421502), we get a palindrome (43912821934).

The spelling of 20512400432 in words is "twenty billion, five hundred twelve million, four hundred thousand, four hundred thirty-two".