20525205511 has 8 divisors (see below), whose sum is σ = 20682368000. Its totient is φ = 20368179000.

The previous prime is 20525205509. The next prime is 20525205553. The reversal of 20525205511 is 11550252502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20525205511 - 2¹ = 20525205509 is a prime.

It is a super-2 number, since 2×20525205511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20525205511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525205011) 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, 280090 + ... + 345688.

It is an arithmetic number, because the mean of its divisors is an integer number (2585296000).

Almost surely, 2^20525205511 is an apocalyptic number.

20525205511 is a deficient number, since it is larger than the sum of its proper divisors (157162489).

20525205511 is a wasteful number, since it uses less digits than its factorization.

20525205511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67989.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 20525205511 in words is "twenty billion, five hundred twenty-five million, two hundred five thousand, five hundred eleven".