20087261 has 4 divisors (see below), whose sum is σ = 20207712. Its totient is φ = 19966812.

The previous prime is 20087231. The next prime is 20087269. The reversal of 20087261 is 16278002.

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 20087261 - 2¹⁴ = 20070877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20087261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20087269) 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, 59975 + ... + 60308.

It is an arithmetic number, because the mean of its divisors is an integer number (5051928).

Almost surely, 2^20087261 is an apocalyptic number.

It is an amenable number.

20087261 is a deficient number, since it is larger than the sum of its proper divisors (120451).

20087261 is a wasteful number, since it uses less digits than its factorization.

20087261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120450.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20087261 is about 4481.8814129783. The cubic root of 20087261 is about 271.8359602375.

The spelling of 20087261 in words is "twenty million, eighty-seven thousand, two hundred sixty-one".