20915456450 has 36 divisors (see below), whose sum is σ = 45254223522. Its totient is φ = 7171012800.

The previous prime is 20915456449. The next prime is 20915456467. The reversal of 20915456450 is 5465451902.

It can be written as a sum of positive squares in 3 ways, for example, as 10440548041 + 10474908409 = 102179^2 + 102347^2 .

It is a super-3 number, since 3×20915456450³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20915456398 and 20915456407.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4266011 + ... + 4270910.

Almost surely, 2^20915456450 is an apocalyptic number.

20915456450 is an abundant number, since it is smaller than the sum of its proper divisors (24338767072).

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

20915456450 is a wasteful number, since it uses less digits than its factorization.

20915456450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8536947 (or 8536935 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 20915456450 in words is "twenty billion, nine hundred fifteen million, four hundred fifty-six thousand, four hundred fifty".