20826873402820 has 24 divisors (see below), whose sum is σ = 44803176443928. Its totient is φ = 8127560352000.

The previous prime is 20826873402793. The next prime is 20826873402871. The reversal of 20826873402820 is 2820437862802.

It can be written as a sum of positive squares in 4 ways, for example, as 125519986944 + 20701353415876 = 354288^2 + 4549874^2 .

It is a super-2 number, since 2×20826873402820² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12699312231 + ... + 12699313870.

It is an arithmetic number, because the mean of its divisors is an integer number (1866799018497).

Almost surely, 2^{20826873402820} is an apocalyptic number.

20826873402820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20826873402820 is an abundant number, since it is smaller than the sum of its proper divisors (23976303041108).

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

20826873402820 is a wasteful number, since it uses less digits than its factorization.

20826873402820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25398626151 (or 25398626149 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 52.

The spelling of 20826873402820 in words is "twenty trillion, eight hundred twenty-six billion, eight hundred seventy-three million, four hundred two thousand, eight hundred twenty".