20725015253 has 4 divisors (see below), whose sum is σ = 20726239680. Its totient is φ = 20723790828.

The previous prime is 20725015193. The next prime is 20725015277. The reversal of 20725015253 is 35251052702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35251052702 = 2 ⋅17625526351.

It is a cyclic number.

It is not a de Polignac number, because 20725015253 - 2¹⁰ = 20725014229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725015153) 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, 586463 + ... + 620796.

It is an arithmetic number, because the mean of its divisors is an integer number (5181559920).

Almost surely, 2^20725015253 is an apocalyptic number.

It is an amenable number.

20725015253 is a deficient number, since it is larger than the sum of its proper divisors (1224427).

20725015253 is a wasteful number, since it uses less digits than its factorization.

20725015253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224426.

The product of its (nonzero) digits is 21000, while the sum is 32.

Adding to 20725015253 its reverse (35251052702), we get a palindrome (55976067955).

The spelling of 20725015253 in words is "twenty billion, seven hundred twenty-five million, fifteen thousand, two hundred fifty-three".