20455491501 has 12 divisors (see below), whose sum is σ = 29549386620. Its totient is φ = 13635810240.

The previous prime is 20455491499. The next prime is 20455491527. The reversal of 20455491501 is 10519455402.

20455491501 is a `hidden beast` number, since 20 + 45 + 5 + 4 + 91 + 501 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19552428900 + 903062601 = 139830^2 + 30051^2 .

It is not a de Polignac number, because 20455491501 - 2¹ = 20455491499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455491571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17995 + ... + 203063.

It is an arithmetic number, because the mean of its divisors is an integer number (2462448885).

Almost surely, 2^20455491501 is an apocalyptic number.

It is an amenable number.

20455491501 is a deficient number, since it is larger than the sum of its proper divisors (9093895119).

20455491501 is a wasteful number, since it uses less digits than its factorization.

20455491501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197356 (or 197353 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 20455491501 in words is "twenty billion, four hundred fifty-five million, four hundred ninety-one thousand, five hundred one".