20454899 has 4 divisors (see below), whose sum is σ = 20760264. Its totient is φ = 20149536.

The previous prime is 20454883. The next prime is 20454901. The reversal of 20454899 is 99845402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99845402 = 2 ⋅49922701.

It is a cyclic number.

It is not a de Polignac number, because 20454899 - 2⁴ = 20454883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20454839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152582 + ... + 152715.

It is an arithmetic number, because the mean of its divisors is an integer number (5190066).

Almost surely, 2^20454899 is an apocalyptic number.

20454899 is a deficient number, since it is larger than the sum of its proper divisors (305365).

20454899 is an equidigital number, since it uses as much as digits as its factorization.

20454899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305364.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 20454899 is about 4522.7092544182. The cubic root of 20454899 is about 273.4843294532.

The spelling of 20454899 in words is "twenty million, four hundred fifty-four thousand, eight hundred ninety-nine".