20720078 has 8 divisors (see below), whose sum is σ = 31101168. Its totient is φ = 10353024.

The previous prime is 20720057. The next prime is 20720083. The reversal of 20720078 is 87002702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1775 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (3887646).

Almost surely, 2^20720078 is an apocalyptic number.

20720078 is a deficient number, since it is larger than the sum of its proper divisors (10381090).

20720078 is a wasteful number, since it uses less digits than its factorization.

20720078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7018.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20720078 is about 4551.9312384965. The cubic root of 20720078 is about 274.6610833089.

The spelling of 20720078 in words is "twenty million, seven hundred twenty thousand, seventy-eight".