20538377 has 4 divisors (see below), whose sum is σ = 20551680. Its totient is φ = 20525076.

The previous prime is 20538361. The next prime is 20538403. The reversal of 20538377 is 77383502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20538377 - 2⁴ = 20538361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20538307) 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, 3977 + ... + 7542.

It is an arithmetic number, because the mean of its divisors is an integer number (5137920).

Almost surely, 2^20538377 is an apocalyptic number.

It is an amenable number.

20538377 is a deficient number, since it is larger than the sum of its proper divisors (13303).

20538377 is a wasteful number, since it uses less digits than its factorization.

20538377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 20538377 is about 4531.9286181492. The cubic root of 20538377 is about 273.8558612834.

The spelling of 20538377 in words is "twenty million, five hundred thirty-eight thousand, three hundred seventy-seven".