20311377 has 4 divisors (see below), whose sum is σ = 27081840. Its totient is φ = 13540916.

The previous prime is 20311363. The next prime is 20311381. The reversal of 20311377 is 77311302.

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 20311377 - 2¹² = 20307281 is a prime.

It is a super-2 number, since 2×20311377² = 825104071272258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20311307) 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, 3385227 + ... + 3385232.

It is an arithmetic number, because the mean of its divisors is an integer number (6770460).

Almost surely, 2^20311377 is an apocalyptic number.

It is an amenable number.

20311377 is a deficient number, since it is larger than the sum of its proper divisors (6770463).

20311377 is an equidigital number, since it uses as much as digits as its factorization.

20311377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770462.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 20311377 is about 4506.8145069439. The cubic root of 20311377 is about 272.8431924297.

Adding to 20311377 its reverse (77311302), we get a palindrome (97622679).

The spelling of 20311377 in words is "twenty million, three hundred eleven thousand, three hundred seventy-seven".