20774905 has 8 divisors (see below), whose sum is σ = 25538184. Its totient is φ = 16214400.

The previous prime is 20774899. The next prime is 20774909. The reversal of 20774905 is 50947702.

It can be written as a sum of positive squares in 4 ways, for example, as 1669264 + 19105641 = 1292^2 + 4371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20774905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20774909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50466 + ... + 50875.

It is an arithmetic number, because the mean of its divisors is an integer number (3192273).

Almost surely, 2^20774905 is an apocalyptic number.

It is an amenable number.

20774905 is a deficient number, since it is larger than the sum of its proper divisors (4763279).

20774905 is a wasteful number, since it uses less digits than its factorization.

20774905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101387.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20774905 is about 4557.9496486907. The cubic root of 20774905 is about 274.9031284144.

The spelling of 20774905 in words is "twenty million, seven hundred seventy-four thousand, nine hundred five".