20515023404 has 12 divisors (see below), whose sum is σ = 36871596384. Its totient is φ = 9980281584.

The previous prime is 20515023391. The next prime is 20515023427. The reversal of 20515023404 is 40432051502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69307364 + ... + 69307659.

It is an arithmetic number, because the mean of its divisors is an integer number (3072633032).

Almost surely, 2^20515023404 is an apocalyptic number.

It is an amenable number.

20515023404 is a deficient number, since it is larger than the sum of its proper divisors (16356572980).

20515023404 is a wasteful number, since it uses less digits than its factorization.

20515023404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138615064 (or 138615062 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20515023404 its reverse (40432051502), we get a palindrome (60947074906).

The spelling of 20515023404 in words is "twenty billion, five hundred fifteen million, twenty-three thousand, four hundred four".