20611963 has 4 divisors (see below), whose sum is σ = 20643808. Its totient is φ = 20580120.

The previous prime is 20611951. The next prime is 20611967. The reversal of 20611963 is 36911602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20611963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611967) 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, 14931 + ... + 16252.

It is an arithmetic number, because the mean of its divisors is an integer number (5160952).

Almost surely, 2^20611963 is an apocalyptic number.

20611963 is a deficient number, since it is larger than the sum of its proper divisors (31845).

20611963 is an equidigital number, since it uses as much as digits as its factorization.

20611963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31844.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20611963 is about 4540.0399777976. The cubic root of 20611963 is about 274.1825332827.

The spelling of 20611963 in words is "twenty million, six hundred eleven thousand, nine hundred sixty-three".