20054989 has 4 divisors (see below), whose sum is σ = 20112156. Its totient is φ = 19997824.

The previous prime is 20054977. The next prime is 20055001. The reversal of 20054989 is 98945002.

20054989 = T₃₆₅₅ + T₃₆₅₆ + T₃₆₅₇.

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

It is an interprime number because it is at equal distance from previous prime (20054977) and next prime (20055001).

It can be written as a sum of positive squares in 2 ways, for example, as 15539364 + 4515625 = 3942^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 20054989 - 2¹³ = 20046797 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 (20054389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28054 + ... + 28759.

It is an arithmetic number, because the mean of its divisors is an integer number (5028039).

Almost surely, 2^20054989 is an apocalyptic number.

20054989 is the 3657-th centered triangular number.

It is an amenable number.

20054989 is a deficient number, since it is larger than the sum of its proper divisors (57167).

20054989 is an equidigital number, since it uses as much as digits as its factorization.

20054989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57166.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 20054989 is about 4478.2796920246. The cubic root of 20054989 is about 271.6903058624.

The spelling of 20054989 in words is "twenty million, fifty-four thousand, nine hundred eighty-nine".