20863478 has 4 divisors (see below), whose sum is σ = 31295220. Its totient is φ = 10431738.

The previous prime is 20863459. The next prime is 20863487. The reversal of 20863478 is 87436802.

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, 5215868 + ... + 5215871.

It is an arithmetic number, because the mean of its divisors is an integer number (7823805).

Almost surely, 2^20863478 is an apocalyptic number.

20863478 is a deficient number, since it is larger than the sum of its proper divisors (10431742).

20863478 is a wasteful number, since it uses less digits than its factorization.

20863478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10431741.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20863478 is about 4567.6556350058. The cubic root of 20863478 is about 275.2932541111.

The spelling of 20863478 in words is "twenty million, eight hundred sixty-three thousand, four hundred seventy-eight".