20401474504949 has 2 divisors, whose sum is σ = 20401474504950. Its totient is φ = 20401474504948.

The previous prime is 20401474504919. The next prime is 20401474504951. The reversal of 20401474504949 is 94940547410402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16290385738225 + 4111088766724 = 4036135^2 + 2027582^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401474504949 - 2²⁴ = 20401457727733 is a prime.

Together with 20401474504951, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20401474504949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401474504919) by changing a digit.

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 as a sum of consecutive naturals, namely, 10200737252474 + 10200737252475.

It is an arithmetic number, because the mean of its divisors is an integer number (10200737252475).

Almost surely, 2^{20401474504949} is an apocalyptic number.

It is an amenable number.

20401474504949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401474504949 is an equidigital number, since it uses as much as digits as its factorization.

20401474504949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 20401474504949 in words is "twenty trillion, four hundred one billion, four hundred seventy-four million, five hundred four thousand, nine hundred forty-nine".