20826977 has 4 divisors (see below), whose sum is σ = 20965056. Its totient is φ = 20688900.

The previous prime is 20826961. The next prime is 20827003. The reversal of 20826977 is 77962802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20826977 - 2⁴ = 20826961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826077) 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, 68813 + ... + 69114.

It is an arithmetic number, because the mean of its divisors is an integer number (5241264).

Almost surely, 2^20826977 is an apocalyptic number.

It is an amenable number.

20826977 is a deficient number, since it is larger than the sum of its proper divisors (138079).

20826977 is a wasteful number, since it uses less digits than its factorization.

20826977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138078.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20826977 is about 4563.6582913273. The cubic root of 20826977 is about 275.1326170277.

The spelling of 20826977 in words is "twenty million, eight hundred twenty-six thousand, nine hundred seventy-seven".