20899027 has 4 divisors (see below), whose sum is σ = 21241696. Its totient is φ = 20556360.

The previous prime is 20898953. The next prime is 20899037. The reversal of 20899027 is 72099802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20899027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20899037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171243 + ... + 171364.

It is an arithmetic number, because the mean of its divisors is an integer number (5310424).

Almost surely, 2^20899027 is an apocalyptic number.

20899027 is a deficient number, since it is larger than the sum of its proper divisors (342669).

20899027 is an equidigital number, since it uses as much as digits as its factorization.

20899027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342668.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20899027 is about 4571.5453623474. The cubic root of 20899027 is about 275.4495215503.

It can be divided in two parts, 208 and 99027, that added together give a triangular number (99235 = T₄₄₅).

The spelling of 20899027 in words is "twenty million, eight hundred ninety-nine thousand, twenty-seven".