20219625828 has 36 divisors (see below), whose sum is σ = 51115160460. Its totient is φ = 6739289856.

The previous prime is 20219625821. The next prime is 20219625871. The reversal of 20219625828 is 82852691202.

20219625828 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 9 + 62 + 582 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16653386304 + 3566239524 = 129048^2 + 59718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20219625821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 655128 + ... + 685296.

Almost surely, 2^20219625828 is an apocalyptic number.

It is an amenable number.

20219625828 is an abundant number, since it is smaller than the sum of its proper divisors (30895534632).

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

20219625828 is a wasteful number, since it uses less digits than its factorization.

20219625828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48796 (or 48791 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20219625828 in words is "twenty billion, two hundred nineteen million, six hundred twenty-five thousand, eight hundred twenty-eight".