20671878 has 16 divisors (see below), whose sum is σ = 41388336. Its totient is φ = 6883200.

The previous prime is 20671873. The next prime is 20671879. The reversal of 20671878 is 87817602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671873) 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, 9850 + ... + 11762.

It is an arithmetic number, because the mean of its divisors is an integer number (2586771).

Almost surely, 2^20671878 is an apocalyptic number.

20671878 is an abundant number, since it is smaller than the sum of its proper divisors (20716458).

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

20671878 is a wasteful number, since it uses less digits than its factorization.

20671878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 20671878 is about 4546.6336997827. The cubic root of 20671878 is about 274.4479415281.

The spelling of 20671878 in words is "twenty million, six hundred seventy-one thousand, eight hundred seventy-eight".