20497136712 has 64 divisors (see below), whose sum is σ = 55362303360. Its totient is φ = 6286502400.

The previous prime is 20497136689. The next prime is 20497136717. The reversal of 20497136712 is 21763179402.

It is a super-2 number, since 2×20497136712² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20497136717) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8589 + ... + 202652.

It is an arithmetic number, because the mean of its divisors is an integer number (865035990).

Almost surely, 2^20497136712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20497136712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27681151680).

20497136712 is an abundant number, since it is smaller than the sum of its proper divisors (34865166648).

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

20497136712 is a wasteful number, since it uses less digits than its factorization.

20497136712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211574 (or 211570 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The spelling of 20497136712 in words is "twenty billion, four hundred ninety-seven million, one hundred thirty-six thousand, seven hundred twelve".