20515545443046 has 64 divisors (see below), whose sum is σ = 43601276805120. Its totient is φ = 6417160485120.

The previous prime is 20515545442999. The next prime is 20515545443047. The reversal of 20515545443046 is 64034454551502.

It is a junction number, because it is equal to n+sod(n) for n = 20515545442986 and 20515545443004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515545443047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7784616 + ... + 10081236.

It is an arithmetic number, because the mean of its divisors is an integer number (681269950080).

Almost surely, 2^{20515545443046} is an apocalyptic number.

20515545443046 is an abundant number, since it is smaller than the sum of its proper divisors (23085731362074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515545443046 is a wasteful number, since it uses less digits than its factorization.

20515545443046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297389.

The product of its (nonzero) digits is 5760000, while the sum is 48.

Adding to 20515545443046 its reverse (64034454551502), we get a palindrome (84549999994548).

The spelling of 20515545443046 in words is "twenty trillion, five hundred fifteen billion, five hundred forty-five million, four hundred forty-three thousand, forty-six".