20355764 has 48 divisors (see below), whose sum is σ = 44076480. Its totient is φ = 8087040.

The previous prime is 20355757. The next prime is 20355773. The reversal of 20355764 is 46755302.

It is a self number, because there is not a number n which added to its sum of digits gives 20355764.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9932 + ... + 11804.

It is an arithmetic number, because the mean of its divisors is an integer number (918260).

Almost surely, 2^20355764 is an apocalyptic number.

It is an amenable number.

20355764 is an abundant number, since it is smaller than the sum of its proper divisors (23720716).

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

20355764 is a wasteful number, since it uses less digits than its factorization.

20355764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 20355764 is about 4511.7362511565. The cubic root of 20355764 is about 273.0417983561.

The spelling of 20355764 in words is "twenty million, three hundred fifty-five thousand, seven hundred sixty-four".