20890153 has 4 divisors (see below), whose sum is σ = 20903620. Its totient is φ = 20876688.

The previous prime is 20890099. The next prime is 20890183. The reversal of 20890153 is 35109802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18896409 + 1993744 = 4347^2 + 1412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20890153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20890183) 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, 4050 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (5225905).

Almost surely, 2^20890153 is an apocalyptic number.

It is an amenable number.

20890153 is a deficient number, since it is larger than the sum of its proper divisors (13467).

20890153 is a wasteful number, since it uses less digits than its factorization.

20890153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20890153 is about 4570.5746903426. The cubic root of 20890153 is about 275.4105295420.

Adding to 20890153 its reverse (35109802), we get a palindrome (55999955).

The spelling of 20890153 in words is "twenty million, eight hundred ninety thousand, one hundred fifty-three".