20783428625 has 32 divisors (see below), whose sum is σ = 27811330560. Its totient is φ = 15450489600.

The previous prime is 20783428583. The next prime is 20783428643. The reversal of 20783428625 is 52682438702.

It is not a de Polignac number, because 20783428625 - 2¹⁴ = 20783412241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20783428625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105974 + ... + 229776.

It is an arithmetic number, because the mean of its divisors is an integer number (869104080).

Almost surely, 2^20783428625 is an apocalyptic number.

20783428625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20783428625 is a deficient number, since it is larger than the sum of its proper divisors (7027901935).

20783428625 is a wasteful number, since it uses less digits than its factorization.

20783428625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123914 (or 123904 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 20783428625 in words is "twenty billion, seven hundred eighty-three million, four hundred twenty-eight thousand, six hundred twenty-five".