20663077 has 4 divisors (see below), whose sum is σ = 20786976. Its totient is φ = 20539180.

The previous prime is 20663053. The next prime is 20663087. The reversal of 20663077 is 77036602.

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 20663077 - 2⁷ = 20662949 is a prime.

It is a super-2 number, since 2×20663077² = 853925502215858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663017) 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 3 ways as a sum of consecutive naturals, for example, 61699 + ... + 62032.

It is an arithmetic number, because the mean of its divisors is an integer number (5196744).

Almost surely, 2^20663077 is an apocalyptic number.

It is an amenable number.

20663077 is a deficient number, since it is larger than the sum of its proper divisors (123899).

20663077 is a wasteful number, since it uses less digits than its factorization.

20663077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123898.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 20663077 is about 4545.6657378210. The cubic root of 20663077 is about 274.4089874927.

Adding to 20663077 its reverse (77036602), we get a palindrome (97699679).

The spelling of 20663077 in words is "twenty million, six hundred sixty-three thousand, seventy-seven".