20235431509 has 8 divisors (see below), whose sum is σ = 21401408480. Its totient is φ = 19079550000.

The previous prime is 20235431497. The next prime is 20235431521. The reversal of 20235431509 is 90513453202.

It is an interprime number because it is at equal distance from previous prime (20235431497) and next prime (20235431521).

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 20235431509 - 2⁵ = 20235431477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235431569) 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, 2519742 + ... + 2527759.

It is an arithmetic number, because the mean of its divisors is an integer number (2675176060).

Almost surely, 2^20235431509 is an apocalyptic number.

It is an amenable number.

20235431509 is a deficient number, since it is larger than the sum of its proper divisors (1165976971).

20235431509 is a wasteful number, since it uses less digits than its factorization.

20235431509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5047731.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 20235431509 in words is "twenty billion, two hundred thirty-five million, four hundred thirty-one thousand, five hundred nine".