20387860 has 24 divisors (see below), whose sum is σ = 43242696. Its totient is φ = 8073600.

The previous prime is 20387849. The next prime is 20387897. The reversal of 20387860 is 6878302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6874884 + 13512976 = 2622^2 + 3676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3027 + ... + 7066.

It is an arithmetic number, because the mean of its divisors is an integer number (1801779).

Almost surely, 2^20387860 is an apocalyptic number.

20387860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20387860 is an abundant number, since it is smaller than the sum of its proper divisors (22854836).

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

20387860 is a wasteful number, since it uses less digits than its factorization.

20387860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203 (or 10201 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20387860 is about 4515.2917956650. The cubic root of 20387860 is about 273.1852294355.

The spelling of 20387860 in words is "twenty million, three hundred eighty-seven thousand, eight hundred sixty".