20956234 has 8 divisors (see below), whose sum is σ = 33852420. Its totient is φ = 9672096.

The previous prime is 20956211. The next prime is 20956261. The reversal of 20956234 is 43265902.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 299209 = 4545^2 + 547^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20956196 and 20956205.

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 in 3 ways as a sum of consecutive naturals, for example, 402979 + ... + 403030.

Almost surely, 2^20956234 is an apocalyptic number.

20956234 is a deficient number, since it is larger than the sum of its proper divisors (12896186).

20956234 is a wasteful number, since it uses less digits than its factorization.

20956234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806024.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20956234 is about 4577.7979422425. The cubic root of 20956234 is about 275.7006223118.

The spelling of 20956234 in words is "twenty million, nine hundred fifty-six thousand, two hundred thirty-four".