20387774 has 12 divisors (see below), whose sum is σ = 33614952. Its totient is φ = 9267060.

The previous prime is 20387771. The next prime is 20387789. The reversal of 20387774 is 47778302.

It is a super-2 number, since 2×20387774² = 831322657350152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41882 + ... + 42365.

It is an arithmetic number, because the mean of its divisors is an integer number (2801246).

Almost surely, 2^20387774 is an apocalyptic number.

20387774 is a deficient number, since it is larger than the sum of its proper divisors (13227178).

20387774 is a wasteful number, since it uses less digits than its factorization.

20387774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84271 (or 84260 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 20387774 is about 4515.2822724609. The cubic root of 20387774 is about 273.1848453187.

The spelling of 20387774 in words is "twenty million, three hundred eighty-seven thousand, seven hundred seventy-four".