20641077 has 12 divisors (see below), whose sum is σ = 31568940. Its totient is φ = 12951168.

The previous prime is 20641073. The next prime is 20641099. The reversal of 20641077 is 77014602.

It can be written as a sum of positive squares in 2 ways, for example, as 9790641 + 10850436 = 3129^2 + 3294^2 .

It is not a de Polignac number, because 20641077 - 2² = 20641073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20641077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67302 + ... + 67607.

It is an arithmetic number, because the mean of its divisors is an integer number (2630745).

Almost surely, 2^20641077 is an apocalyptic number.

It is an amenable number.

20641077 is a deficient number, since it is larger than the sum of its proper divisors (10927863).

20641077 is a wasteful number, since it uses less digits than its factorization.

20641077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134932 (or 134929 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20641077 is about 4543.2452057973. The cubic root of 20641077 is about 274.3115650626.

Adding to 20641077 its reverse (77014602), we get a palindrome (97655679).

The spelling of 20641077 in words is "twenty million, six hundred forty-one thousand, seventy-seven".