20554989 has 64 divisors (see below), whose sum is σ = 36900864. Its totient is φ = 9870336.

The previous prime is 20554973. The next prime is 20554991. The reversal of 20554989 is 98945502.

20554989 = T₅₆ + T₅₇ + ... + T₄₉₇.

It is not a de Polignac number, because 20554989 - 2⁴ = 20554973 is a prime.

It is a super-3 number, since 3×20554989³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20554989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 199512 + ... + 199614.

It is an arithmetic number, because the mean of its divisors is an integer number (576576).

Almost surely, 2^20554989 is an apocalyptic number.

It is an amenable number.

20554989 is a deficient number, since it is larger than the sum of its proper divisors (16345875).

20554989 is a wasteful number, since it uses less digits than its factorization.

20554989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 20554989 is about 4533.7610214920. The cubic root of 20554989 is about 273.9296754183.

The spelling of 20554989 in words is "twenty million, five hundred fifty-four thousand, nine hundred eighty-nine".