20251952720 has 20 divisors (see below), whose sum is σ = 47085790260. Its totient is φ = 8100781056.

The previous prime is 20251952719. The next prime is 20251952723. The reversal of 20251952720 is 2725915202.

It can be written as a sum of positive squares in 2 ways, for example, as 11354181136 + 8897771584 = 106556^2 + 94328^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251952723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126574625 + ... + 126574784.

It is an arithmetic number, because the mean of its divisors is an integer number (2354289513).

Almost surely, 2^20251952720 is an apocalyptic number.

20251952720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251952720 is an abundant number, since it is smaller than the sum of its proper divisors (26833837540).

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

20251952720 is a wasteful number, since it uses less digits than its factorization.

20251952720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253149422 (or 253149416 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 20251952720 in words is "twenty billion, two hundred fifty-one million, nine hundred fifty-two thousand, seven hundred twenty".