20077391 has 4 divisors (see below), whose sum is σ = 21258432. Its totient is φ = 18896352.

The previous prime is 20077363. The next prime is 20077403. The reversal of 20077391 is 19377002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19377002 = 2 ⋅9688501.

It is a cyclic number.

It is not a de Polignac number, because 20077391 - 2⁶ = 20077327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20077361) 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, 590495 + ... + 590528.

It is an arithmetic number, because the mean of its divisors is an integer number (5314608).

Almost surely, 2^20077391 is an apocalyptic number.

20077391 is a deficient number, since it is larger than the sum of its proper divisors (1181041).

20077391 is a wasteful number, since it uses less digits than its factorization.

20077391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181040.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 20077391 is about 4480.7801776030. The cubic root of 20077391 is about 271.7914301829.

The spelling of 20077391 in words is "twenty million, seventy-seven thousand, three hundred ninety-one".