20078646 has 16 divisors (see below), whose sum is σ = 45894144. Its totient is φ = 5736744.

The previous prime is 20078633. The next prime is 20078647. The reversal of 20078646 is 64687002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238990 + ... + 239073.

It is an arithmetic number, because the mean of its divisors is an integer number (2868384).

Almost surely, 2^20078646 is an apocalyptic number.

20078646 is an abundant number, since it is smaller than the sum of its proper divisors (25815498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20078646 is a wasteful number, since it uses less digits than its factorization.

20078646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478075.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20078646 is about 4480.9202179909. The cubic root of 20078646 is about 271.7970931222.

The spelling of 20078646 in words is "twenty million, seventy-eight thousand, six hundred forty-six".