20691516604 has 24 divisors (see below), whose sum is σ = 39561984000. Its totient is φ = 9390949680.

The previous prime is 20691516557. The next prime is 20691516619. The reversal of 20691516604 is 40661519602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327804 + ... + 385795.

It is an arithmetic number, because the mean of its divisors is an integer number (1648416000).

Almost surely, 2^20691516604 is an apocalyptic number.

It is an amenable number.

20691516604 is a deficient number, since it is larger than the sum of its proper divisors (18870467396).

20691516604 is a wasteful number, since it uses less digits than its factorization.

20691516604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714273 (or 714271 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 20691516604 in words is "twenty billion, six hundred ninety-one million, five hundred sixteen thousand, six hundred four".