20804821992 has 48 divisors (see below), whose sum is σ = 56790090240. Its totient is φ = 6880331808.

The previous prime is 20804821991. The next prime is 20804821993. The reversal of 20804821992 is 29912840802.

It is a happy number.

20804821992 is a `hidden beast` number, since 2 + 0 + 80 + 482 + 1 + 9 + 92 = 666.

It is an interprime number because it is at equal distance from previous prime (20804821991) and next prime (20804821993).

It is not an unprimeable number, because it can be changed into a prime (20804821991) 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, 1128478 + ... + 1146765.

It is an arithmetic number, because the mean of its divisors is an integer number (1183126880).

Almost surely, 2^20804821992 is an apocalyptic number.

It is an amenable number.

20804821992 is an abundant number, since it is smaller than the sum of its proper divisors (35985268248).

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

20804821992 is a wasteful number, since it uses less digits than its factorization.

20804821992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275382 (or 2275375 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 20804821992 in words is "twenty billion, eight hundred four million, eight hundred twenty-one thousand, nine hundred ninety-two".