20012078 has 4 divisors (see below), whose sum is σ = 30018120. Its totient is φ = 10006038.

The previous prime is 20012063. The next prime is 20012099. The reversal of 20012078 is 87021002.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5003018 + ... + 5003021.

It is an arithmetic number, because the mean of its divisors is an integer number (7504530).

Almost surely, 2^20012078 is an apocalyptic number.

20012078 is a deficient number, since it is larger than the sum of its proper divisors (10006042).

20012078 is a wasteful number, since it uses less digits than its factorization.

20012078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006041.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20012078 is about 4473.4861126419. The cubic root of 20012078 is about 271.4963918905.

The spelling of 20012078 in words is "twenty million, twelve thousand, seventy-eight".