20078407 has 4 divisors (see below), whose sum is σ = 20087536. Its totient is φ = 20069280.

The previous prime is 20078393. The next prime is 20078417. The reversal of 20078407 is 70487002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20078407 - 2¹¹ = 20076359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078417) 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, 982 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (5021884).

Almost surely, 2^20078407 is an apocalyptic number.

20078407 is a deficient number, since it is larger than the sum of its proper divisors (9129).

20078407 is an equidigital number, since it uses as much as digits as its factorization.

20078407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20078407 is about 4480.8935492823. The cubic root of 20078407 is about 271.7960147001.

The spelling of 20078407 in words is "twenty million, seventy-eight thousand, four hundred seven".