20977927 has 4 divisors (see below), whose sum is σ = 21544936. Its totient is φ = 20410920.

The previous prime is 20977889. The next prime is 20977951. The reversal of 20977927 is 72977902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72977902 = 2 ⋅36488951.

It is a cyclic number.

It is not a de Polignac number, because 20977927 - 2⁷ = 20977799 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 (20977967) 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, 283449 + ... + 283522.

It is an arithmetic number, because the mean of its divisors is an integer number (5386234).

Almost surely, 2^20977927 is an apocalyptic number.

20977927 is a deficient number, since it is larger than the sum of its proper divisors (567009).

20977927 is an equidigital number, since it uses as much as digits as its factorization.

20977927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567008.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 20977927 is about 4580.1667000230. The cubic root of 20977927 is about 275.7957206822.

It can be divided in two parts, 20977 and 927, that added together give a square (21904 = 148²).

The spelling of 20977927 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred twenty-seven".