20923478 has 4 divisors (see below), whose sum is σ = 31385220. Its totient is φ = 10461738.

The previous prime is 20923459. The next prime is 20923493. The reversal of 20923478 is 87432902.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5230868 + ... + 5230871.

It is an arithmetic number, because the mean of its divisors is an integer number (7846305).

Almost surely, 2^20923478 is an apocalyptic number.

20923478 is a deficient number, since it is larger than the sum of its proper divisors (10461742).

20923478 is a wasteful number, since it uses less digits than its factorization.

20923478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10461741.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20923478 is about 4574.2188404142. The cubic root of 20923478 is about 275.5569012127.

The spelling of 20923478 in words is "twenty million, nine hundred twenty-three thousand, four hundred seventy-eight".