20725696505 has 16 divisors (see below), whose sum is σ = 25716096000. Its totient is φ = 16018841280.

The previous prime is 20725696499. The next prime is 20725696507. The reversal of 20725696505 is 50569652702.

It is not a de Polignac number, because 20725696505 - 2¹⁰ = 20725695481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20725696505.

It is not an unprimeable number, because it can be changed into a prime (20725696507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18770 + ... + 204459.

It is an arithmetic number, because the mean of its divisors is an integer number (1607256000).

Almost surely, 2^20725696505 is an apocalyptic number.

It is an amenable number.

20725696505 is a deficient number, since it is larger than the sum of its proper divisors (4990399495).

20725696505 is a wasteful number, since it uses less digits than its factorization.

20725696505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223864.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 20725696505 in words is "twenty billion, seven hundred twenty-five million, six hundred ninety-six thousand, five hundred five".