20078890 has 36 divisors (see below), whose sum is σ = 39498354. Its totient is φ = 7345728.

The previous prime is 20078867. The next prime is 20078897. The reversal of 20078890 is 9887002.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 356409 + 19722481 = 597^2 + 4441^2 .

It is not an unprimeable number, because it can be changed into a prime (20078897) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 184156 + ... + 184264.

Almost surely, 2^20078890 is an apocalyptic number.

20078890 is a deficient number, since it is larger than the sum of its proper divisors (19419464).

20078890 is a wasteful number, since it uses less digits than its factorization.

20078890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 20078890 is about 4480.9474444586. The cubic root of 20078890 is about 271.7981940965.

The spelling of 20078890 in words is "twenty million, seventy-eight thousand, eight hundred ninety".