20647941 has 4 divisors (see below), whose sum is σ = 27530592. Its totient is φ = 13765292.

The previous prime is 20647933. The next prime is 20647943. The reversal of 20647941 is 14974602.

It is a happy number.

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 20647941 - 2³ = 20647933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20647943) 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, 3441321 + ... + 3441326.

It is an arithmetic number, because the mean of its divisors is an integer number (6882648).

Almost surely, 2^20647941 is an apocalyptic number.

It is an amenable number.

20647941 is a deficient number, since it is larger than the sum of its proper divisors (6882651).

20647941 is an equidigital number, since it uses as much as digits as its factorization.

20647941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882650.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20647941 is about 4544.0005501760. Note that the first 3 decimals coincide. The cubic root of 20647941 is about 274.3419682874.

The spelling of 20647941 in words is "twenty million, six hundred forty-seven thousand, nine hundred forty-one".