20471973 has 4 divisors (see below), whose sum is σ = 27295968. Its totient is φ = 13647980.

The previous prime is 20471963. The next prime is 20471977. The reversal of 20471973 is 37917402.

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 20471973 - 2¹² = 20467877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471977) 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, 3411993 + ... + 3411998.

It is an arithmetic number, because the mean of its divisors is an integer number (6823992).

Almost surely, 2^20471973 is an apocalyptic number.

It is an amenable number.

20471973 is a deficient number, since it is larger than the sum of its proper divisors (6823995).

20471973 is an equidigital number, since it uses as much as digits as its factorization.

20471973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823994.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20471973 is about 4524.5964460933. The cubic root of 20471973 is about 273.5604020657.

The spelling of 20471973 in words is "twenty million, four hundred seventy-one thousand, nine hundred seventy-three".