20419478 has 4 divisors (see below), whose sum is σ = 30629220. Its totient is φ = 10209738.

The previous prime is 20419459. The next prime is 20419481. The reversal of 20419478 is 87491402.

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

It is a Curzon number.

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, 5104868 + ... + 5104871.

It is an arithmetic number, because the mean of its divisors is an integer number (7657305).

Almost surely, 2^20419478 is an apocalyptic number.

20419478 is a deficient number, since it is larger than the sum of its proper divisors (10209742).

20419478 is a wasteful number, since it uses less digits than its factorization.

20419478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209741.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20419478 is about 4518.7916526434. The cubic root of 20419478 is about 273.3263773099.

The spelling of 20419478 in words is "twenty million, four hundred nineteen thousand, four hundred seventy-eight".