20519878 has 16 divisors (see below), whose sum is σ = 31950000. Its totient is φ = 9872352.

The previous prime is 20519869. The next prime is 20519879. The reversal of 20519878 is 87891502.

It is a self number, because there is not a number n which added to its sum of digits gives 20519878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20519879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28588 + ... + 29296.

It is an arithmetic number, because the mean of its divisors is an integer number (1996875).

Almost surely, 2^20519878 is an apocalyptic number.

20519878 is a deficient number, since it is larger than the sum of its proper divisors (11430122).

20519878 is a wasteful number, since it uses less digits than its factorization.

20519878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20519878 is about 4529.8871950635. The cubic root of 20519878 is about 273.7736155548.

The spelling of 20519878 in words is "twenty million, five hundred nineteen thousand, eight hundred seventy-eight".