20468989 has 4 divisors (see below), whose sum is σ = 20945056. Its totient is φ = 19992924.

The previous prime is 20468957. The next prime is 20468999. The reversal of 20468989 is 98986402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98986402 = 2 ⋅49493201.

It is a cyclic number.

It is not a de Polignac number, because 20468989 - 2⁵ = 20468957 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 (20468939) 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, 237969 + ... + 238054.

It is an arithmetic number, because the mean of its divisors is an integer number (5236264).

Almost surely, 2^20468989 is an apocalyptic number.

It is an amenable number.

20468989 is a deficient number, since it is larger than the sum of its proper divisors (476067).

20468989 is an equidigital number, since it uses as much as digits as its factorization.

20468989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476066.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 20468989 is about 4524.2666809108. The cubic root of 20468989 is about 273.5471100086.

The spelling of 20468989 in words is "twenty million, four hundred sixty-eight thousand, nine hundred eighty-nine".