20320478 has 4 divisors (see below), whose sum is σ = 30480720. Its totient is φ = 10160238.

The previous prime is 20320463. The next prime is 20320483. The reversal of 20320478 is 87402302.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20320478² = 825843652296968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5080118 + ... + 5080121.

It is an arithmetic number, because the mean of its divisors is an integer number (7620180).

Almost surely, 2^20320478 is an apocalyptic number.

20320478 is a deficient number, since it is larger than the sum of its proper divisors (10160242).

20320478 is a wasteful number, since it uses less digits than its factorization.

20320478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10160241.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20320478 is about 4507.8240870735. The cubic root of 20320478 is about 272.8839376585.

The spelling of 20320478 in words is "twenty million, three hundred twenty thousand, four hundred seventy-eight".