20601720019 has 4 divisors (see below), whose sum is σ = 20602097280. Its totient is φ = 20601342760.

The previous prime is 20601720017. The next prime is 20601720101. The reversal of 20601720019 is 91002710602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20601720019 - 2¹ = 20601720017 is a prime.

It is a super-2 number, since 2×20601720019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601720017) 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, 89272 + ... + 221749.

It is an arithmetic number, because the mean of its divisors is an integer number (5150524320).

Almost surely, 2^20601720019 is an apocalyptic number.

20601720019 is a deficient number, since it is larger than the sum of its proper divisors (377261).

20601720019 is an equidigital number, since it uses as much as digits as its factorization.

20601720019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377260.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 20601720019 in words is "twenty billion, six hundred one million, seven hundred twenty thousand, nineteen".