20102002078 has 4 divisors (see below), whose sum is σ = 30153003120. Its totient is φ = 10051001038.

The previous prime is 20102002003. The next prime is 20102002079. The reversal of 20102002078 is 87020020102.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102002079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025500518 + ... + 5025500521.

It is an arithmetic number, because the mean of its divisors is an integer number (7538250780).

Almost surely, 2^20102002078 is an apocalyptic number.

20102002078 is a deficient number, since it is larger than the sum of its proper divisors (10051001042).

20102002078 is a wasteful number, since it uses less digits than its factorization.

20102002078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051001041.

The product of its (nonzero) digits is 448, while the sum is 22.

The spelling of 20102002078 in words is "twenty billion, one hundred two million, two thousand, seventy-eight".