20890706 has 8 divisors (see below), whose sum is σ = 31499004. Its totient is φ = 10391040.

The previous prime is 20890691. The next prime is 20890711. The reversal of 20890706 is 60709802.

It can be written as a sum of positive squares in 2 ways, for example, as 15642025 + 5248681 = 3955^2 + 2291^2 .

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

It is a Curzon 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, 26675 + ... + 27446.

Almost surely, 2^20890706 is an apocalyptic number.

20890706 is a deficient number, since it is larger than the sum of its proper divisors (10608298).

20890706 is a wasteful number, since it uses less digits than its factorization.

20890706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54316.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20890706 is about 4570.6351856170. The cubic root of 20890706 is about 275.4129597249.

The spelling of 20890706 in words is "twenty million, eight hundred ninety thousand, seven hundred six".