20727869 has 4 divisors (see below), whose sum is σ = 20758140. Its totient is φ = 20697600.

The previous prime is 20727851. The next prime is 20727877. The reversal of 20727869 is 96872702.

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 14784025 + 5943844 = 3845^2 + 2438^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727869 - 2¹⁶ = 20662333 is a prime.

It is a super-2 number, since 2×20727869² = 859289106562322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727829) 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, 14084 + ... + 15485.

It is an arithmetic number, because the mean of its divisors is an integer number (5189535).

Almost surely, 2^20727869 is an apocalyptic number.

It is an amenable number.

20727869 is a deficient number, since it is larger than the sum of its proper divisors (30271).

20727869 is an equidigital number, since it uses as much as digits as its factorization.

20727869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30270.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20727869 is about 4552.7869486722. The cubic root of 20727869 is about 274.6955042917.

The spelling of 20727869 in words is "twenty million, seven hundred twenty-seven thousand, eight hundred sixty-nine".