20856238 has 8 divisors (see below), whose sum is σ = 33690888. Its totient is φ = 9625944.

The previous prime is 20856223. The next prime is 20856259. The reversal of 20856238 is 83265802.

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, 401056 + ... + 401107.

It is an arithmetic number, because the mean of its divisors is an integer number (4211361).

Almost surely, 2^20856238 is an apocalyptic number.

20856238 is a deficient number, since it is larger than the sum of its proper divisors (12834650).

20856238 is a wasteful number, since it uses less digits than its factorization.

20856238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802178.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20856238 is about 4566.8630371405. The cubic root of 20856238 is about 275.2614065327.

The spelling of 20856238 in words is "twenty million, eight hundred fifty-six thousand, two hundred thirty-eight".