20078456 has 8 divisors (see below), whose sum is σ = 37647120. Its totient is φ = 10039224.

The previous prime is 20078453. The next prime is 20078507. The reversal of 20078456 is 65487002.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1254896 + ... + 1254911.

It is an arithmetic number, because the mean of its divisors is an integer number (4705890).

Almost surely, 2^20078456 is an apocalyptic number.

It is an amenable number.

20078456 is a deficient number, since it is larger than the sum of its proper divisors (17568664).

20078456 is a wasteful number, since it uses less digits than its factorization.

20078456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509813 (or 2509809 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20078456 is about 4480.8990169385. The cubic root of 20078456 is about 271.7962357999.

The spelling of 20078456 in words is "twenty million, seventy-eight thousand, four hundred fifty-six".