20077257 has 4 divisors (see below), whose sum is σ = 26769680. Its totient is φ = 13384836.

The previous prime is 20077247. The next prime is 20077271. The reversal of 20077257 is 75277002.

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 not a de Polignac number, because 20077257 - 2¹⁰ = 20076233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20077217) 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, 3346207 + ... + 3346212.

It is an arithmetic number, because the mean of its divisors is an integer number (6692420).

Almost surely, 2^20077257 is an apocalyptic number.

It is an amenable number.

20077257 is a deficient number, since it is larger than the sum of its proper divisors (6692423).

20077257 is an equidigital number, since it uses as much as digits as its factorization.

20077257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692422.

The product of its (nonzero) digits is 6860, while the sum is 30.

The square root of 20077257 is about 4480.7652248249. The cubic root of 20077257 is about 271.7908255205.

The spelling of 20077257 in words is "twenty million, seventy-seven thousand, two hundred fifty-seven".