20078707 has 4 divisors (see below), whose sum is σ = 21904056. Its totient is φ = 18253360.

The previous prime is 20078693. The next prime is 20078741. The reversal of 20078707 is 70787002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20078707 - 2⁷ = 20078579 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20078777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912658 + ... + 912679.

It is an arithmetic number, because the mean of its divisors is an integer number (5476014).

Almost surely, 2^20078707 is an apocalyptic number.

20078707 is a deficient number, since it is larger than the sum of its proper divisors (1825349).

20078707 is a wasteful number, since it uses less digits than its factorization.

20078707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825348.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 20078707 is about 4480.9270246234. The cubic root of 20078707 is about 271.7973683666.

The spelling of 20078707 in words is "twenty million, seventy-eight thousand, seven hundred seven".