20292505 has 4 divisors (see below), whose sum is σ = 24351012. Its totient is φ = 16234000.

The previous prime is 20292487. The next prime is 20292511. The reversal of 20292505 is 50529202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14047504 + 6245001 = 3748^2 + 2499^2 .

It is not a de Polignac number, because 20292505 - 2⁵ = 20292473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20292505.

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 3 ways as a sum of consecutive naturals, for example, 2029246 + ... + 2029255.

It is an arithmetic number, because the mean of its divisors is an integer number (6087753).

Almost surely, 2^20292505 is an apocalyptic number.

It is an amenable number.

20292505 is a deficient number, since it is larger than the sum of its proper divisors (4058507).

20292505 is an equidigital number, since it uses as much as digits as its factorization.

20292505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058506.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20292505 is about 4504.7203020831. The cubic root of 20292505 is about 272.7586635753.

The spelling of 20292505 in words is "twenty million, two hundred ninety-two thousand, five hundred five".