20345816 has 16 divisors (see below), whose sum is σ = 38208240. Its totient is φ = 10156960.

The previous prime is 20345807. The next prime is 20345833. The reversal of 20345816 is 61854302.

It is a congruent 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, 4781 + ... + 7971.

It is an arithmetic number, because the mean of its divisors is an integer number (2388015).

Almost surely, 2^20345816 is an apocalyptic number.

It is an amenable number.

20345816 is a deficient number, since it is larger than the sum of its proper divisors (17862424).

20345816 is a wasteful number, since it uses less digits than its factorization.

20345816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994 (or 3990 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20345816 is about 4510.6336583677. The cubic root of 20345816 is about 272.9973119818.

The spelling of 20345816 in words is "twenty million, three hundred forty-five thousand, eight hundred sixteen".