20038549 has 4 divisors (see below), whose sum is σ = 20048364. Its totient is φ = 20028736.

The previous prime is 20038541. The next prime is 20038609. The reversal of 20038549 is 94583002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7128900 + 12909649 = 2670^2 + 3593^2 .

It is a cyclic number.

It is not a de Polignac number, because 20038549 - 2³ = 20038541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20038549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20038541) 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, 562 + ... + 6355.

It is an arithmetic number, because the mean of its divisors is an integer number (5012091).

Almost surely, 2^20038549 is an apocalyptic number.

It is an amenable number.

20038549 is a deficient number, since it is larger than the sum of its proper divisors (9815).

20038549 is an equidigital number, since it uses as much as digits as its factorization.

20038549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9814.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20038549 is about 4476.4437894382. The cubic root of 20038549 is about 271.6160465401.

The spelling of 20038549 in words is "twenty million, thirty-eight thousand, five hundred forty-nine".