20401557635245 has 8 divisors (see below), whose sum is σ = 24484395989880. Its totient is φ = 16319561556480.

The previous prime is 20401557635219. The next prime is 20401557635279. The reversal of 20401557635245 is 54253675510402.

It can be written as a sum of positive squares in 4 ways, for example, as 4902801207529 + 15498756427716 = 2214227^2 + 3936846^2 .

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

It is not a de Polignac number, because 20401557635245 - 2¹⁷ = 20401557504173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210515676 + ... + 210612565.

It is an arithmetic number, because the mean of its divisors is an integer number (3060549498735).

Almost surely, 2^{20401557635245} is an apocalyptic number.

It is an amenable number.

20401557635245 is a deficient number, since it is larger than the sum of its proper divisors (4082838354635).

20401557635245 is an equidigital number, since it uses as much as digits as its factorization.

20401557635245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421137935.

The product of its (nonzero) digits is 5040000, while the sum is 49.

The spelling of 20401557635245 in words is "twenty trillion, four hundred one billion, five hundred fifty-seven million, six hundred thirty-five thousand, two hundred forty-five".