20305878 has 8 divisors (see below), whose sum is σ = 40611768. Its totient is φ = 6768624.

The previous prime is 20305861. The next prime is 20305897. The reversal of 20305878 is 87850302.

It is a sphenic number, since it is the product of 3 distinct primes.

20305878 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1692151 + ... + 1692162.

It is an arithmetic number, because the mean of its divisors is an integer number (5076471).

Almost surely, 2^20305878 is an apocalyptic number.

20305878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20305878 is a wasteful number, since it uses less digits than its factorization.

20305878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384318.

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

The square root of 20305878 is about 4506.2043895057. The cubic root of 20305878 is about 272.8185674763.

The spelling of 20305878 in words is "twenty million, three hundred five thousand, eight hundred seventy-eight".