20526240309 has 8 divisors (see below), whose sum is σ = 27884704032. Its totient is φ = 13425968400.

The previous prime is 20526240277. The next prime is 20526240337. The reversal of 20526240309 is 90304262502.

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

It is not a de Polignac number, because 20526240309 - 2⁵ = 20526240277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20526240309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20526240349) 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, 64547767 + ... + 64548084.

It is an arithmetic number, because the mean of its divisors is an integer number (3485588004).

Almost surely, 2^20526240309 is an apocalyptic number.

It is an amenable number.

20526240309 is a deficient number, since it is larger than the sum of its proper divisors (7358463723).

20526240309 is a wasteful number, since it uses less digits than its factorization.

20526240309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129095907.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 20526240309 in words is "twenty billion, five hundred twenty-six million, two hundred forty thousand, three hundred nine".