20576469997 has 2 divisors, whose sum is σ = 20576469998. Its totient is φ = 20576469996.

The previous prime is 20576469989. The next prime is 20576470003. The reversal of 20576469997 is 79996467502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16789421476 + 3787048521 = 129574^2 + 61539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20576469997 - 2³ = 20576469989 is a prime.

It is a super-2 number, since 2×20576469997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20576469097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288234998 + 10288234999.

It is an arithmetic number, because the mean of its divisors is an integer number (10288234999).

Almost surely, 2^20576469997 is an apocalyptic number.

It is an amenable number.

20576469997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20576469997 is an equidigital number, since it uses as much as digits as its factorization.

20576469997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51438240, while the sum is 64.

The spelling of 20576469997 in words is "twenty billion, five hundred seventy-six million, four hundred sixty-nine thousand, nine hundred ninety-seven".