20770689 has 4 divisors (see below), whose sum is σ = 27694256. Its totient is φ = 13847124.

The previous prime is 20770681. The next prime is 20770697. The reversal of 20770689 is 98607702.

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 an interprime number because it is at equal distance from previous prime (20770681) and next prime (20770697).

It is not a de Polignac number, because 20770689 - 2³ = 20770681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20770681) 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, 3461779 + ... + 3461784.

It is an arithmetic number, because the mean of its divisors is an integer number (6923564).

Almost surely, 2^20770689 is an apocalyptic number.

It is an amenable number.

20770689 is a deficient number, since it is larger than the sum of its proper divisors (6923567).

20770689 is an equidigital number, since it uses as much as digits as its factorization.

20770689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923566.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20770689 is about 4557.4871365699. The cubic root of 20770689 is about 274.8845311373.

The spelling of 20770689 in words is "twenty million, seven hundred seventy thousand, six hundred eighty-nine".