20386989 has 18 divisors (see below), whose sum is σ = 34256430. Its totient is φ = 11649456.

The previous prime is 20386969. The next prime is 20386999. The reversal of 20386989 is 98968302.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 1764 = 4515^2 + 42^2 .

It is not a de Polignac number, because 20386989 - 2⁵ = 20386957 is a prime.

It is a super-2 number, since 2×20386989² = 831258640972242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20386909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22674 + ... + 23555.

It is an arithmetic number, because the mean of its divisors is an integer number (1903135).

Almost surely, 2^20386989 is an apocalyptic number.

It is an amenable number.

20386989 is a deficient number, since it is larger than the sum of its proper divisors (13869441).

20386989 is a wasteful number, since it uses less digits than its factorization.

20386989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46249 (or 46239 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20386989 is about 4515.1953446113. The cubic root of 20386989 is about 273.1813390857.

The spelling of 20386989 in words is "twenty million, three hundred eighty-six thousand, nine hundred eighty-nine".