20504232461 has 2 divisors, whose sum is σ = 20504232462. Its totient is φ = 20504232460.

The previous prime is 20504232439. The next prime is 20504232467. The reversal of 20504232461 is 16423240502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19430687236 + 1073545225 = 139394^2 + 32765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20504232461 is a prime.

It is a super-2 number, since 2×20504232461² (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 (20504232467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252116230 + 10252116231.

It is an arithmetic number, because the mean of its divisors is an integer number (10252116231).

Almost surely, 2^20504232461 is an apocalyptic number.

It is an amenable number.

20504232461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504232461 is an equidigital number, since it uses as much as digits as its factorization.

20504232461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 20504232461 its reverse (16423240502), we get a palindrome (36927472963).

The spelling of 20504232461 in words is "twenty billion, five hundred four million, two hundred thirty-two thousand, four hundred sixty-one".