20652989 has 4 divisors (see below), whose sum is σ = 23603424. Its totient is φ = 17702556.

The previous prime is 20652967. The next prime is 20653001. The reversal of 20652989 is 98925602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20652989 - 2¹² = 20648893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651989) 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, 1475207 + ... + 1475220.

It is an arithmetic number, because the mean of its divisors is an integer number (5900856).

Almost surely, 2^20652989 is an apocalyptic number.

It is an amenable number.

20652989 is a deficient number, since it is larger than the sum of its proper divisors (2950435).

20652989 is an equidigital number, since it uses as much as digits as its factorization.

20652989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950434.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 20652989 is about 4544.5559739099. Note that the first 3 decimals coincide. The cubic root of 20652989 is about 274.3643234690.

The spelling of 20652989 in words is "twenty million, six hundred fifty-two thousand, nine hundred eighty-nine".