20520878 has 8 divisors (see below), whose sum is σ = 35178672. Its totient is φ = 8794656.

The previous prime is 20520859. The next prime is 20520881. The reversal of 20520878 is 87802502.

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

It is a super-2 number, since 2×20520878² = 842212867781768, which contains 22 as substring.

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, 732875 + ... + 732902.

It is an arithmetic number, because the mean of its divisors is an integer number (4397334).

Almost surely, 2^20520878 is an apocalyptic number.

20520878 is a deficient number, since it is larger than the sum of its proper divisors (14657794).

20520878 is a wasteful number, since it uses less digits than its factorization.

20520878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465786.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20520878 is about 4529.9975717433. The cubic root of 20520878 is about 273.7780627737.

The spelling of 20520878 in words is "twenty million, five hundred twenty thousand, eight hundred seventy-eight".