20455721774540 has 48 divisors (see below), whose sum is σ = 46262364811488. Its totient is φ = 7552724619264.

The previous prime is 20455721774503. The next prime is 20455721774549. The reversal of 20455721774540 is 4547712755402.

It is not an unprimeable number, because it can be changed into a prime (20455721774549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12081644 + ... + 13670316.

It is an arithmetic number, because the mean of its divisors is an integer number (963799266906).

Almost surely, 2^{20455721774540} is an apocalyptic number.

20455721774540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455721774540 is an abundant number, since it is smaller than the sum of its proper divisors (25806643036948).

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

20455721774540 is a wasteful number, since it uses less digits than its factorization.

20455721774540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638218 (or 1638216 counting only the distinct ones).

The product of its (nonzero) digits is 10976000, while the sum is 53.

The spelling of 20455721774540 in words is "twenty trillion, four hundred fifty-five billion, seven hundred twenty-one million, seven hundred seventy-four thousand, five hundred forty".