20478377 has 4 divisors (see below), whose sum is σ = 20512080. Its totient is φ = 20444676.

The previous prime is 20478373. The next prime is 20478397. The reversal of 20478377 is 77387402.

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 20478377 - 2² = 20478373 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 20478377.

It is not an unprimeable number, because it can be changed into a prime (20478373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15923 + ... + 17160.

It is an arithmetic number, because the mean of its divisors is an integer number (5128020).

Almost surely, 2^20478377 is an apocalyptic number.

It is an amenable number.

20478377 is a deficient number, since it is larger than the sum of its proper divisors (33703).

20478377 is an equidigital number, since it uses as much as digits as its factorization.

20478377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33702.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 20478377 is about 4525.3040781808. The cubic root of 20478377 is about 273.5889239571.

The spelling of 20478377 in words is "twenty million, four hundred seventy-eight thousand, three hundred seventy-seven".