20723649447508 has 48 divisors (see below), whose sum is σ = 41482828800000. Its totient is φ = 8873953814880.

The previous prime is 20723649447491. The next prime is 20723649447509. The reversal of 20723649447508 is 80574494632702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723649447509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155167743 + ... + 155301241.

It is an arithmetic number, because the mean of its divisors is an integer number (864225600000).

Almost surely, 2^{20723649447508} is an apocalyptic number.

20723649447508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20723649447508 is an abundant number, since it is smaller than the sum of its proper divisors (20759179352492).

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

20723649447508 is a wasteful number, since it uses less digits than its factorization.

20723649447508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138220 (or 138218 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 61.

The spelling of 20723649447508 in words is "twenty trillion, seven hundred twenty-three billion, six hundred forty-nine million, four hundred forty-seven thousand, five hundred eight".