20387768 has 16 divisors (see below), whose sum is σ = 38312880. Its totient is φ = 10171008.

The previous prime is 20387761. The next prime is 20387771. The reversal of 20387768 is 86778302.

It is a super-2 number, since 2×20387768² = 831322168043648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387761) 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, 1280 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (2394555).

Almost surely, 2^20387768 is an apocalyptic number.

It is an amenable number.

20387768 is a deficient number, since it is larger than the sum of its proper divisors (17925112).

20387768 is a wasteful number, since it uses less digits than its factorization.

20387768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20387768 is about 4515.2816080506. The cubic root of 20387768 is about 273.1848185198.

The spelling of 20387768 in words is "twenty million, three hundred eighty-seven thousand, seven hundred sixty-eight".