20577081 has 16 divisors (see below), whose sum is σ = 31524224. Its totient is φ = 11695104.

The previous prime is 20577079. The next prime is 20577103. The reversal of 20577081 is 18077502.

It is a happy number.

It is not a de Polignac number, because 20577081 - 2¹ = 20577079 is a prime.

It is a super-2 number, since 2×20577081² = 846832524961122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20577071) 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, 1515 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1970264).

Almost surely, 2^20577081 is an apocalyptic number.

20577081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20577081 is a deficient number, since it is larger than the sum of its proper divisors (10947143).

20577081 is a wasteful number, since it uses less digits than its factorization.

20577081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20577081 is about 4536.1967549920. The cubic root of 20577081 is about 274.0277779215.

The spelling of 20577081 in words is "twenty million, five hundred seventy-seven thousand, eighty-one".