20263641 has 4 divisors (see below), whose sum is σ = 27018192. Its totient is φ = 13509092.

The previous prime is 20263637. The next prime is 20263657. The reversal of 20263641 is 14636202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20263641 - 2² = 20263637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20263601) 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 3 ways as a sum of consecutive naturals, for example, 3377271 + ... + 3377276.

It is an arithmetic number, because the mean of its divisors is an integer number (6754548).

Almost surely, 2^20263641 is an apocalyptic number.

It is an amenable number.

20263641 is a deficient number, since it is larger than the sum of its proper divisors (6754551).

20263641 is an equidigital number, since it uses as much as digits as its factorization.

20263641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754550.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20263641 is about 4501.5154115031. The cubic root of 20263641 is about 272.6292785008.

Adding to 20263641 its reverse (14636202), we get a palindrome (34899843).

The spelling of 20263641 in words is "twenty million, two hundred sixty-three thousand, six hundred forty-one".