20715011 has 4 divisors (see below), whose sum is σ = 20734800. Its totient is φ = 20695224.

The previous prime is 20715007. The next prime is 20715041. The reversal of 20715011 is 11051702.

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

It is a cyclic number.

It is not a de Polignac number, because 20715011 - 2² = 20715007 is a prime.

It is a super-2 number, since 2×20715011² = 858223361460242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20715041) 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, 8231 + ... + 10448.

It is an arithmetic number, because the mean of its divisors is an integer number (5183700).

Almost surely, 2^20715011 is an apocalyptic number.

20715011 is a deficient number, since it is larger than the sum of its proper divisors (19789).

20715011 is a wasteful number, since it uses less digits than its factorization.

20715011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19788.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 20715011 is about 4551.3746275164. The cubic root of 20715011 is about 274.6386924477.

Adding to 20715011 its reverse (11051702), we get a palindrome (31766713).

The spelling of 20715011 in words is "twenty million, seven hundred fifteen thousand, eleven".