20638427 has 8 divisors (see below), whose sum is σ = 21826560. Its totient is φ = 19460520.

The previous prime is 20638421. The next prime is 20638451. The reversal of 20638427 is 72483602.

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 20638427 - 2⁶ = 20638363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20638393 and 20638402.

It is not an unprimeable number, because it can be changed into a prime (20638421) 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, 1802 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (2728320).

Almost surely, 2^20638427 is an apocalyptic number.

20638427 is a deficient number, since it is larger than the sum of its proper divisors (1188133).

20638427 is a wasteful number, since it uses less digits than its factorization.

20638427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20638427 is about 4542.9535546822. The cubic root of 20638427 is about 274.2998254175.

The spelling of 20638427 in words is "twenty million, six hundred thirty-eight thousand, four hundred twenty-seven".