20770261 has 4 divisors (see below), whose sum is σ = 20780224. Its totient is φ = 20760300.

The previous prime is 20770241. The next prime is 20770271. The reversal of 20770261 is 16207702.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20770261 - 2⁵ = 20770229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770241) 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, 525 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (5195056).

Almost surely, 2^20770261 is an apocalyptic number.

It is an amenable number.

20770261 is a deficient number, since it is larger than the sum of its proper divisors (9963).

20770261 is an equidigital number, since it uses as much as digits as its factorization.

20770261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9962.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 20770261 is about 4557.4401806277. The cubic root of 20770261 is about 274.8826430377.

Adding to 20770261 its reverse (16207702), we get a palindrome (36977963).

The spelling of 20770261 in words is "twenty million, seven hundred seventy thousand, two hundred sixty-one".