20890139 has 8 divisors (see below), whose sum is σ = 22049280. Its totient is φ = 19737000.

The previous prime is 20890099. The next prime is 20890183. The reversal of 20890139 is 93109802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20890139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20890939) 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 7 ways as a sum of consecutive naturals, for example, 6914 + ... + 9464.

It is an arithmetic number, because the mean of its divisors is an integer number (2756160).

Almost surely, 2^20890139 is an apocalyptic number.

20890139 is a deficient number, since it is larger than the sum of its proper divisors (1159141).

20890139 is a wasteful number, since it uses less digits than its factorization.

20890139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20890139 is about 4570.5731588062. The cubic root of 20890139 is about 275.4104680178.

The spelling of 20890139 in words is "twenty million, eight hundred ninety thousand, one hundred thirty-nine".