20455008215 has 16 divisors (see below), whose sum is σ = 24648970080. Its totient is φ = 16295437440.

The previous prime is 20455008191. The next prime is 20455008221. The reversal of 20455008215 is 51280055402.

It is a de Polignac number, because none of the positive numbers 2^k-20455008215 is a prime.

It is a super-2 number, since 2×20455008215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3280721 + ... + 3286949.

It is an arithmetic number, because the mean of its divisors is an integer number (1540560630).

Almost surely, 2^20455008215 is an apocalyptic number.

20455008215 is a deficient number, since it is larger than the sum of its proper divisors (4193961865).

20455008215 is a wasteful number, since it uses less digits than its factorization.

20455008215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8882.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 20455008215 in words is "twenty billion, four hundred fifty-five million, eight thousand, two hundred fifteen".