20815755834084 has 24 divisors (see below), whose sum is σ = 48589363219488. Its totient is φ = 6935832953280.

The previous prime is 20815755834079. The next prime is 20815755834113. The reversal of 20815755834084 is 48043855751802.

It is a happy number.

It is a super-2 number, since 2×20815755834084² (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, 344009082 + ... + 344069585.

It is an arithmetic number, because the mean of its divisors is an integer number (2024556800812).

Almost surely, 2^{20815755834084} is an apocalyptic number.

It is an amenable number.

20815755834084 is an abundant number, since it is smaller than the sum of its proper divisors (27773607385404).

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

20815755834084 is a wasteful number, since it uses less digits than its factorization.

20815755834084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688081195 (or 688081193 counting only the distinct ones).

The product of its (nonzero) digits is 43008000, while the sum is 60.

The spelling of 20815755834084 in words is "twenty trillion, eight hundred fifteen billion, seven hundred fifty-five million, eight hundred thirty-four thousand, eighty-four".