20200121180947 has 2 divisors, whose sum is σ = 20200121180948. Its totient is φ = 20200121180946.

The previous prime is 20200121180891. The next prime is 20200121180963. The reversal of 20200121180947 is 74908112100202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20200121180947 - 2²³ = 20200112792339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20200121180047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100060590473 + 10100060590474.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060590474).

Almost surely, 2^{20200121180947} is an apocalyptic number.

20200121180947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200121180947 is an equidigital number, since it uses as much as digits as its factorization.

20200121180947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 20200121180947 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, one hundred eighty thousand, nine hundred forty-seven".