20681775 has 36 divisors (see below), whose sum is σ = 39229632. Its totient is φ = 10379520.

The previous prime is 20681723. The next prime is 20681777. The reversal of 20681775 is 57718602.

It is not a de Polignac number, because 20681775 - 2⁶ = 20681711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681777) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1122 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (1089712).

Almost surely, 2^20681775 is an apocalyptic number.

20681775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20681775 is a deficient number, since it is larger than the sum of its proper divisors (18547857).

20681775 is a wasteful number, since it uses less digits than its factorization.

20681775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440 (or 5432 counting only the distinct ones).

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

The square root of 20681775 is about 4547.7219572001. The cubic root of 20681775 is about 274.4917333551.

The spelling of 20681775 in words is "twenty million, six hundred eighty-one thousand, seven hundred seventy-five".