20463161261506 has 4 divisors (see below), whose sum is σ = 30694741892262. Its totient is φ = 10231580630752.

The previous prime is 20463161261467. The next prime is 20463161261509. The reversal of 20463161261506 is 60516216136402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16485150956481 + 3978010305025 = 4060191^2 + 1994495^2 .

It is not an unprimeable number, because it can be changed into a prime (20463161261509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5115790315375 + ... + 5115790315378.

Almost surely, 2^{20463161261506} is an apocalyptic number.

20463161261506 is a deficient number, since it is larger than the sum of its proper divisors (10231580630756).

20463161261506 is a wasteful number, since it uses less digits than its factorization.

20463161261506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10231580630755.

The product of its (nonzero) digits is 311040, while the sum is 43.

Adding to 20463161261506 its reverse (60516216136402), we get a palindrome (80979377397908).

The spelling of 20463161261506 in words is "twenty trillion, four hundred sixty-three billion, one hundred sixty-one million, two hundred sixty-one thousand, five hundred six".