20677518 has 40 divisors (see below), whose sum is σ = 46797960. Its totient is φ = 6823440.

The previous prime is 20677513. The next prime is 20677519. The reversal of 20677518 is 81577602.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20677513) 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 19 ways as a sum of consecutive naturals, for example, 17073 + ... + 18243.

It is an arithmetic number, because the mean of its divisors is an integer number (1169949).

Almost surely, 2^20677518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20677518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23398980).

20677518 is an abundant number, since it is smaller than the sum of its proper divisors (26120442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20677518 is a wasteful number, since it uses less digits than its factorization.

20677518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 20677518 is about 4547.2538965842. The cubic root of 20677518 is about 274.4728988742.

The spelling of 20677518 in words is "twenty million, six hundred seventy-seven thousand, five hundred eighteen".