20872077 has 4 divisors (see below), whose sum is σ = 27829440. Its totient is φ = 13914716.

The previous prime is 20872067. The next prime is 20872081. The reversal of 20872077 is 77027802.

It is a happy number.

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 20872077 - 2¹² = 20867981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20872067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478677 + ... + 3478682.

It is an arithmetic number, because the mean of its divisors is an integer number (6957360).

Almost surely, 2^20872077 is an apocalyptic number.

It is an amenable number.

20872077 is a deficient number, since it is larger than the sum of its proper divisors (6957363).

20872077 is an equidigital number, since it uses as much as digits as its factorization.

20872077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6957362.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20872077 is about 4568.5968305378. The cubic root of 20872077 is about 275.3310701381.

Adding to 20872077 its reverse (77027802), we get a palindrome (97899879).

The spelling of 20872077 in words is "twenty million, eight hundred seventy-two thousand, seventy-seven".