20770081 has 8 divisors (see below), whose sum is σ = 21790080. Its totient is φ = 19759872.

The previous prime is 20770049. The next prime is 20770109. The reversal of 20770081 is 18007702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20770081 - 2⁵ = 20770049 is a prime.

It is a super-2 number, since 2×20770081² = 862792529493122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20770681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100 + ... + 6778.

It is an arithmetic number, because the mean of its divisors is an integer number (2723760).

Almost surely, 2^20770081 is an apocalyptic number.

It is an amenable number.

20770081 is a deficient number, since it is larger than the sum of its proper divisors (1019999).

20770081 is a wasteful number, since it uses less digits than its factorization.

20770081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4895.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20770081 is about 4557.4204326571. The cubic root of 20770081 is about 274.8818489694.

Adding to 20770081 its reverse (18007702), we get a palindrome (38777783).

The spelling of 20770081 in words is "twenty million, seven hundred seventy thousand, eighty-one".