20715946 has 4 divisors (see below), whose sum is σ = 31073922. Its totient is φ = 10357972.

The previous prime is 20715941. The next prime is 20715973. The reversal of 20715946 is 64951702.

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

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 5978025 = 3839^2 + 2445^2 .

It is not an unprimeable number, because it can be changed into a prime (20715941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5178985 + ... + 5178988.

Almost surely, 2^20715946 is an apocalyptic number.

20715946 is a deficient number, since it is larger than the sum of its proper divisors (10357976).

20715946 is a wasteful number, since it uses less digits than its factorization.

20715946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10357975.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20715946 is about 4551.4773425779. The cubic root of 20715946 is about 274.6428244483.

The spelling of 20715946 in words is "twenty million, seven hundred fifteen thousand, nine hundred forty-six".