20155970609 has 4 divisors (see below), whose sum is σ = 20163587904. Its totient is φ = 20148353316.

The previous prime is 20155970587. The next prime is 20155970617. The reversal of 20155970609 is 90607955102.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 20155970609 - 2¹⁶ = 20155905073 is a prime.

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 20155970609.

It is not an unprimeable number, because it can be changed into a prime (20155970209) 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, 3804677 + ... + 3809970.

It is an arithmetic number, because the mean of its divisors is an integer number (5040896976).

Almost surely, 2^20155970609 is an apocalyptic number.

It is an amenable number.

20155970609 is a deficient number, since it is larger than the sum of its proper divisors (7617295).

20155970609 is an equidigital number, since it uses as much as digits as its factorization.

20155970609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617294.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 20155970609 in words is "twenty billion, one hundred fifty-five million, nine hundred seventy thousand, six hundred nine".