20511445355120 has 40 divisors (see below), whose sum is σ = 48703772384064. Its totient is φ = 8030012648192.

The previous prime is 20511445355119. The next prime is 20511445355153. The reversal of 20511445355120 is 2155354411502.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2727582059 + ... + 2727589578.

Almost surely, 2^{20511445355120} is an apocalyptic number.

20511445355120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511445355120 is an abundant number, since it is smaller than the sum of its proper divisors (28192327028944).

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

20511445355120 is a wasteful number, since it uses less digits than its factorization.

20511445355120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455171697 (or 5455171691 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 20511445355120 its reverse (2155354411502), we get a palindrome (22666799766622).

The spelling of 20511445355120 in words is "twenty trillion, five hundred eleven billion, four hundred forty-five million, three hundred fifty-five thousand, one hundred twenty".