20436957619 has 8 divisors (see below), whose sum is σ = 22136253552. Its totient is φ = 18755836320.

The previous prime is 20436957617. The next prime is 20436957647. The reversal of 20436957619 is 91675963402.

It is a happy number.

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

It is not a de Polignac number, because 20436957619 - 2¹ = 20436957617 is a prime.

It is a super-2 number, since 2×20436957619² (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 (20436957613) 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, 4541317 + ... + 4545814.

It is an arithmetic number, because the mean of its divisors is an integer number (2767031694).

Almost surely, 2^20436957619 is an apocalyptic number.

20436957619 is a deficient number, since it is larger than the sum of its proper divisors (1699295933).

20436957619 is a wasteful number, since it uses less digits than its factorization.

20436957619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9087317.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 20436957619 in words is "twenty billion, four hundred thirty-six million, nine hundred fifty-seven thousand, six hundred nineteen".