20774487 has 4 divisors (see below), whose sum is σ = 27699320. Its totient is φ = 13849656.

The previous prime is 20774483. The next prime is 20774503. The reversal of 20774487 is 78447702.

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

It is not a de Polignac number, because 20774487 - 2² = 20774483 is a prime.

It is a super-2 number, since 2×20774487² = 863158620226338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774483) 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, 3462412 + ... + 3462417.

It is an arithmetic number, because the mean of its divisors is an integer number (6924830).

Almost surely, 2^20774487 is an apocalyptic number.

20774487 is a deficient number, since it is larger than the sum of its proper divisors (6924833).

20774487 is an equidigital number, since it uses as much as digits as its factorization.

20774487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924832.

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 20774487 is about 4557.9037945091. The cubic root of 20774487 is about 274.9012846791.

The spelling of 20774487 in words is "twenty million, seven hundred seventy-four thousand, four hundred eighty-seven".