20799977 has 16 divisors (see below), whose sum is σ = 23622144. Its totient is φ = 18144000.

The previous prime is 20799973. The next prime is 20799983. The reversal of 20799977 is 77999702.

It is a cyclic number.

It is not a de Polignac number, because 20799977 - 2² = 20799973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20799973) 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, 61553 + ... + 61889.

It is an arithmetic number, because the mean of its divisors is an integer number (1476384).

Almost surely, 2^20799977 is an apocalyptic number.

It is an amenable number.

20799977 is a deficient number, since it is larger than the sum of its proper divisors (2822167).

20799977 is a wasteful number, since it uses less digits than its factorization.

20799977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 500094, while the sum is 50.

The square root of 20799977 is about 4560.6991788540. The cubic root of 20799977 is about 275.0136720475.

It can be divided in two parts, 20 and 799977, that added together give a palindrome (799997).

The spelling of 20799977 in words is "twenty million, seven hundred ninety-nine thousand, nine hundred seventy-seven".