20645078 has 8 divisors (see below), whose sum is σ = 31194072. Its totient is φ = 10247056.

The previous prime is 20645069. The next prime is 20645083. The reversal of 20645078 is 87054602.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 37400 + ... + 37947.

It is an arithmetic number, because the mean of its divisors is an integer number (3899259).

Almost surely, 2^20645078 is an apocalyptic number.

20645078 is a deficient number, since it is larger than the sum of its proper divisors (10548994).

20645078 is a wasteful number, since it uses less digits than its factorization.

20645078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75486.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20645078 is about 4543.6855084832. The cubic root of 20645078 is about 274.3292878082.

The spelling of 20645078 in words is "twenty million, six hundred forty-five thousand, seventy-eight".