20770487 has 4 divisors (see below), whose sum is σ = 20787960. Its totient is φ = 20753016.

The previous prime is 20770459. The next prime is 20770489. The reversal of 20770487 is 78407702.

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

It is a cyclic number.

It is not a de Polignac number, because 20770487 - 2⁶ = 20770423 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 (20770489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6812 + ... + 9377.

It is an arithmetic number, because the mean of its divisors is an integer number (5196990).

Almost surely, 2^20770487 is an apocalyptic number.

20770487 is a deficient number, since it is larger than the sum of its proper divisors (17473).

20770487 is a wasteful number, since it uses less digits than its factorization.

20770487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17472.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 20770487 is about 4557.4649751808. The cubic root of 20770487 is about 274.8836400281.

The spelling of 20770487 in words is "twenty million, seven hundred seventy thousand, four hundred eighty-seven".