20455340 has 36 divisors (see below), whose sum is σ = 43984416. Its totient is φ = 7990752.

The previous prime is 20455327. The next prime is 20455361. The reversal of 20455340 is 4355402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43949 + ... + 44411.

Almost surely, 2^20455340 is an apocalyptic number.

20455340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455340 is an abundant number, since it is smaller than the sum of its proper divisors (23529076).

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

20455340 is a wasteful number, since it uses less digits than its factorization.

20455340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20455340 is about 4522.7580081185. The cubic root of 20455340 is about 273.4862948458.

The spelling of 20455340 in words is "twenty million, four hundred fifty-five thousand, three hundred forty".