20422478 has 4 divisors (see below), whose sum is σ = 30633720. Its totient is φ = 10211238.

The previous prime is 20422447. The next prime is 20422499. The reversal of 20422478 is 87422402.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20422478.

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, 5105618 + ... + 5105621.

It is an arithmetic number, because the mean of its divisors is an integer number (7658430).

Almost surely, 2^20422478 is an apocalyptic number.

20422478 is a deficient number, since it is larger than the sum of its proper divisors (10211242).

20422478 is a wasteful number, since it uses less digits than its factorization.

20422478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10211241.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20422478 is about 4519.1235875997. The cubic root of 20422478 is about 273.3397622257.

The spelling of 20422478 in words is "twenty million, four hundred twenty-two thousand, four hundred seventy-eight".