20423847 has 8 divisors (see below), whose sum is σ = 27252720. Its totient is φ = 13605440.

The previous prime is 20423833. The next prime is 20423873. The reversal of 20423847 is 74832402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20423847 - 2⁴ = 20423831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5929 + ... + 8717.

It is an arithmetic number, because the mean of its divisors is an integer number (3406590).

Almost surely, 2^20423847 is an apocalyptic number.

20423847 is a deficient number, since it is larger than the sum of its proper divisors (6828873).

20423847 is a wasteful number, since it uses less digits than its factorization.

20423847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5233.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20423847 is about 4519.2750524835. The cubic root of 20423847 is about 273.3458697733.

The spelling of 20423847 in words is "twenty million, four hundred twenty-three thousand, eight hundred forty-seven".