20725720258 has 16 divisors (see below), whose sum is σ = 32800775040. Its totient is φ = 9794660400.

The previous prime is 20725720241. The next prime is 20725720273. The reversal of 20725720258 is 85202752702.

It is a self number, because there is not a number n which added to its sum of digits gives 20725720258.

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, 616353 + ... + 649108.

It is an arithmetic number, because the mean of its divisors is an integer number (2050048440).

Almost surely, 2^20725720258 is an apocalyptic number.

20725720258 is a deficient number, since it is larger than the sum of its proper divisors (12075054782).

20725720258 is a wasteful number, since it uses less digits than its factorization.

20725720258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265913.

The product of its (nonzero) digits is 156800, while the sum is 40.

The spelling of 20725720258 in words is "twenty billion, seven hundred twenty-five million, seven hundred twenty thousand, two hundred fifty-eight".