20149963 has 4 divisors (see below), whose sum is σ = 20162520. Its totient is φ = 20137408.

The previous prime is 20149957. The next prime is 20149967. The reversal of 20149963 is 36994102.

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

It is a cyclic number.

It is not a de Polignac number, because 20149963 - 2⁵ = 20149931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20149967) 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, 3445 + ... + 7222.

It is an arithmetic number, because the mean of its divisors is an integer number (5040630).

Almost surely, 2^20149963 is an apocalyptic number.

20149963 is a deficient number, since it is larger than the sum of its proper divisors (12557).

20149963 is a wasteful number, since it uses less digits than its factorization.

20149963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12556.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20149963 is about 4488.8710161910. The cubic root of 20149963 is about 272.1185100288.

It can be divided in two parts, 20149 and 963, that added together give a palindrome (21112).

The spelling of 20149963 in words is "twenty million, one hundred forty-nine thousand, nine hundred sixty-three".