20078538 has 16 divisors (see below), whose sum is σ = 40201056. Its totient is φ = 6685520.

The previous prime is 20078533. The next prime is 20078551. The reversal of 20078538 is 83587002.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20078499 and 20078508.

It is not an unprimeable number, because it can be changed into a prime (20078533) 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, 9433 + ... + 11363.

It is an arithmetic number, because the mean of its divisors is an integer number (2512566).

Almost surely, 2^20078538 is an apocalyptic number.

20078538 is an abundant number, since it is smaller than the sum of its proper divisors (20122518).

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

20078538 is a wasteful number, since it uses less digits than its factorization.

20078538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3669.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20078538 is about 4480.9081668787. The cubic root of 20078538 is about 271.7966058028.

The spelling of 20078538 in words is "twenty million, seventy-eight thousand, five hundred thirty-eight".