20556238 has 8 divisors (see below), whose sum is σ = 31667832. Its totient is φ = 10000296.

The previous prime is 20556223. The next prime is 20556269. The reversal of 20556238 is 83265502.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138820 + ... + 138967.

It is an arithmetic number, because the mean of its divisors is an integer number (3958479).

Almost surely, 2^20556238 is an apocalyptic number.

20556238 is a deficient number, since it is larger than the sum of its proper divisors (11111594).

20556238 is a wasteful number, since it uses less digits than its factorization.

20556238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277826.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20556238 is about 4533.8987637573. The cubic root of 20556238 is about 273.9352236453.

The spelling of 20556238 in words is "twenty million, five hundred fifty-six thousand, two hundred thirty-eight".