20954459 has 4 divisors (see below), whose sum is σ = 21441816. Its totient is φ = 20467104.

The previous prime is 20954447. The next prime is 20954467. The reversal of 20954459 is 95445902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20954459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20954959) 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, 243614 + ... + 243699.

It is an arithmetic number, because the mean of its divisors is an integer number (5360454).

Almost surely, 2^20954459 is an apocalyptic number.

20954459 is a deficient number, since it is larger than the sum of its proper divisors (487357).

20954459 is an equidigital number, since it uses as much as digits as its factorization.

20954459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487356.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 20954459 is about 4577.6040676319. The cubic root of 20954459 is about 275.6928381139.

The spelling of 20954459 in words is "twenty million, nine hundred fifty-four thousand, four hundred fifty-nine".