20387773 has 6 divisors (see below), whose sum is σ = 23716446. Its totient is φ = 17475192.

The previous prime is 20387771. The next prime is 20387789. The reversal of 20387773 is 37778302.

It can be written as a sum of positive squares in only one way, i.e., 17994564 + 2393209 = 4242^2 + 1547^2 .

It is not a de Polignac number, because 20387773 - 2¹ = 20387771 is a prime.

It is a super-2 number, since 2×20387773² = 831322575799058, which contains 22 as substring.

It is a Duffinian number.

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, 207990 + ... + 208087.

It is an arithmetic number, because the mean of its divisors is an integer number (3952741).

Almost surely, 2^20387773 is an apocalyptic number.

It is an amenable number.

20387773 is a deficient number, since it is larger than the sum of its proper divisors (3328673).

20387773 is an equidigital number, since it uses as much as digits as its factorization.

20387773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416091 (or 416084 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 20387773 is about 4515.2821617259. The cubic root of 20387773 is about 273.1848408522.

The spelling of 20387773 in words is "twenty million, three hundred eighty-seven thousand, seven hundred seventy-three".