20715601 has 4 divisors (see below), whose sum is σ = 20789604. Its totient is φ = 20641600.

The previous prime is 20715589. The next prime is 20715623. The reversal of 20715601 is 10651702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9486400 + 11229201 = 3080^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 20715601 - 2⁷ = 20715473 is a prime.

It is a super-2 number, since 2×20715601² = 858272249582402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20715641) 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, 36580 + ... + 37141.

It is an arithmetic number, because the mean of its divisors is an integer number (5197401).

Almost surely, 2^20715601 is an apocalyptic number.

It is an amenable number.

20715601 is a deficient number, since it is larger than the sum of its proper divisors (74003).

20715601 is an equidigital number, since it uses as much as digits as its factorization.

20715601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74002.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20715601 is about 4551.4394426379. The cubic root of 20715601 is about 274.6412998208.

It can be divided in two parts, 20715 and 601, that added together give a square (21316 = 146²).

The spelling of 20715601 in words is "twenty million, seven hundred fifteen thousand, six hundred one".