20900834 has 4 divisors (see below), whose sum is σ = 31351254. Its totient is φ = 10450416.

The previous prime is 20900833. The next prime is 20900843. The reversal of 20900834 is 43800902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 225625 = 4547^2 + 475^2 .

It is not an unprimeable number, because it can be changed into a prime (20900833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5225207 + ... + 5225210.

Almost surely, 2^20900834 is an apocalyptic number.

20900834 is a deficient number, since it is larger than the sum of its proper divisors (10450420).

20900834 is a wasteful number, since it uses less digits than its factorization.

20900834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450419.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20900834 is about 4571.7429936513. The cubic root of 20900834 is about 275.4574600848.

The spelling of 20900834 in words is "twenty million, nine hundred thousand, eight hundred thirty-four".