20696400844 has 48 divisors (see below), whose sum is σ = 41622658560. Its totient is φ = 8820725760.

The previous prime is 20696400839. The next prime is 20696400863. The reversal of 20696400844 is 44800469602.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20696400844.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8954449 + ... + 8956759.

It is an arithmetic number, because the mean of its divisors is an integer number (867138720).

Almost surely, 2^20696400844 is an apocalyptic number.

It is an amenable number.

20696400844 is an abundant number, since it is smaller than the sum of its proper divisors (20926257716).

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

20696400844 is a wasteful number, since it uses less digits than its factorization.

20696400844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 20696400844 in words is "twenty billion, six hundred ninety-six million, four hundred thousand, eight hundred forty-four".