20870078 has 4 divisors (see below), whose sum is σ = 31305120. Its totient is φ = 10435038.

The previous prime is 20870077. The next prime is 20870089. The reversal of 20870078 is 87007802.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5217518 + ... + 5217521.

It is an arithmetic number, because the mean of its divisors is an integer number (7826280).

Almost surely, 2^20870078 is an apocalyptic number.

20870078 is a deficient number, since it is larger than the sum of its proper divisors (10435042).

20870078 is a wasteful number, since it uses less digits than its factorization.

20870078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10435041.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20870078 is about 4568.3780491549. The cubic root of 20870078 is about 275.3222800149.

The spelling of 20870078 in words is "twenty million, eight hundred seventy thousand, seventy-eight".