20455514505 has 24 divisors (see below), whose sum is σ = 35459566272. Its totient is φ = 10908579744.

The previous prime is 20455514479. The next prime is 20455514533. The reversal of 20455514505 is 50541555402.

20455514505 is a `hidden beast` number, since 20 + 45 + 551 + 45 + 0 + 5 = 666.

It is not a de Polignac number, because 20455514505 - 2⁵ = 20455514473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20455514505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 860692 + ... + 884138.

It is an arithmetic number, because the mean of its divisors is an integer number (1477481928).

Almost surely, 2^20455514505 is an apocalyptic number.

It is an amenable number.

20455514505 is a deficient number, since it is larger than the sum of its proper divisors (15004051767).

20455514505 is a wasteful number, since it uses less digits than its factorization.

20455514505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42845 (or 42842 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 20455514505 in words is "twenty billion, four hundred fifty-five million, five hundred fourteen thousand, five hundred five".