20620511819 has 2 divisors, whose sum is σ = 20620511820. Its totient is φ = 20620511818.

The previous prime is 20620511809. The next prime is 20620511861. The reversal of 20620511819 is 91811502602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20620511819 - 2²⁸ = 20352076363 is a prime.

It is a super-2 number, since 2×20620511819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20620511809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310255909 + 10310255910.

It is an arithmetic number, because the mean of its divisors is an integer number (10310255910).

Almost surely, 2^20620511819 is an apocalyptic number.

20620511819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620511819 is an equidigital number, since it uses as much as digits as its factorization.

20620511819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 20620511819 in words is "twenty billion, six hundred twenty million, five hundred eleven thousand, eight hundred nineteen".