20205544001 has 2 divisors, whose sum is σ = 20205544002. Its totient is φ = 20205544000.

The previous prime is 20205543997. The next prime is 20205544043. The reversal of 20205544001 is 10044550202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19667257600 + 538286401 = 140240^2 + 23201^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205544001 - 2² = 20205543997 is a prime.

It is not a weakly prime, because it can be changed into another prime (20205544501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102772000 + 10102772001.

It is an arithmetic number, because the mean of its divisors is an integer number (10102772001).

Almost surely, 2^20205544001 is an apocalyptic number.

It is an amenable number.

20205544001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205544001 is an equidigital number, since it uses as much as digits as its factorization.

20205544001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 20205544001 in words is "twenty billion, two hundred five million, five hundred forty-four thousand, one".