20352989 has 4 divisors (see below), whose sum is σ = 20379324. Its totient is φ = 20326656.

The previous prime is 20352973. The next prime is 20352991. The reversal of 20352989 is 98925302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 4687225 = 3958^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352989 - 2⁴ = 20352973 is a prime.

It is a super-2 number, since 2×20352989² = 828488322468242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20352919) 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, 11972 + ... + 13565.

It is an arithmetic number, because the mean of its divisors is an integer number (5094831).

Almost surely, 2^20352989 is an apocalyptic number.

It is an amenable number.

20352989 is a deficient number, since it is larger than the sum of its proper divisors (26335).

20352989 is an equidigital number, since it uses as much as digits as its factorization.

20352989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26334.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20352989 is about 4511.4287094002. The cubic root of 20352989 is about 273.0293903158.

The spelling of 20352989 in words is "twenty million, three hundred fifty-two thousand, nine hundred eighty-nine".