20406677 has 4 divisors (see below), whose sum is σ = 20421600. Its totient is φ = 20391756.

The previous prime is 20406667. The next prime is 20406679. The reversal of 20406677 is 77660402.

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 20406677 - 2¹² = 20402581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406679) 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, 5177 + ... + 8222.

It is an arithmetic number, because the mean of its divisors is an integer number (5105400).

Almost surely, 2^20406677 is an apocalyptic number.

It is an amenable number.

20406677 is a deficient number, since it is larger than the sum of its proper divisors (14923).

20406677 is a wasteful number, since it uses less digits than its factorization.

20406677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14922.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20406677 is about 4517.3750121060. The cubic root of 20406677 is about 273.2692491379.

The spelling of 20406677 in words is "twenty million, four hundred six thousand, six hundred seventy-seven".