20765717420 has 24 divisors (see below), whose sum is σ = 49837722144. Its totient is φ = 7119674496.

The previous prime is 20765717393. The next prime is 20765717429. The reversal of 20765717420 is 2471756702.

It is not an unprimeable number, because it can be changed into a prime (20765717429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74163137 + ... + 74163416.

It is an arithmetic number, because the mean of its divisors is an integer number (2076571756).

Almost surely, 2^20765717420 is an apocalyptic number.

20765717420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20765717420 is an abundant number, since it is smaller than the sum of its proper divisors (29072004724).

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

20765717420 is a wasteful number, since it uses less digits than its factorization.

20765717420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148326569 (or 148326567 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 20765717420 in words is "twenty billion, seven hundred sixty-five million, seven hundred seventeen thousand, four hundred twenty".