20675977 has 16 divisors (see below), whose sum is σ = 24592384. Its totient is φ = 17010000.

The previous prime is 20675969. The next prime is 20675983. The reversal of 20675977 is 77957602.

It is a happy number.

20675977 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 20675977 - 2³ = 20675969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20675917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32452 + ... + 33082.

It is an arithmetic number, because the mean of its divisors is an integer number (1537024).

Almost surely, 2^20675977 is an apocalyptic number.

It is an amenable number.

20675977 is a deficient number, since it is larger than the sum of its proper divisors (3916407).

20675977 is a wasteful number, since it uses less digits than its factorization.

20675977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 20675977 is about 4547.0844505023. The cubic root of 20675977 is about 274.4660803053.

The spelling of 20675977 in words is "twenty million, six hundred seventy-five thousand, nine hundred seventy-seven".