20445678 has 48 divisors (see below), whose sum is σ = 49900032. Its totient is φ = 5994000.

The previous prime is 20445637. The next prime is 20445697. The reversal of 20445678 is 87654402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4473 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (1039584).

Almost surely, 2^20445678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20445678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24950016).

20445678 is an abundant number, since it is smaller than the sum of its proper divisors (29454354).

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

20445678 is a wasteful number, since it uses less digits than its factorization.

20445678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381 (or 3378 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 20445678 is about 4521.6897284091. The cubic root of 20445678 is about 273.4432280030.

The spelling of 20445678 in words is "twenty million, four hundred forty-five thousand, six hundred seventy-eight".