20454551 has 8 divisors (see below), whose sum is σ = 22135344. Its totient is φ = 18789120.

The previous prime is 20454547. The next prime is 20454557. The reversal of 20454551 is 15545402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20454551 - 2² = 20454547 is a prime.

It is a super-2 number, since 2×20454551² = 836777313223202, which contains 22 as substring.

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 20454551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (2766918).

Almost surely, 2^20454551 is an apocalyptic number.

20454551 is a deficient number, since it is larger than the sum of its proper divisors (1680793).

20454551 is a wasteful number, since it uses less digits than its factorization.

20454551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7681.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 20454551 is about 4522.6707817395. The cubic root of 20454551 is about 273.4827785112.

Adding to 20454551 its reverse (15545402), we get a palindrome (35999953).

The spelling of 20454551 in words is "twenty million, four hundred fifty-four thousand, five hundred fifty-one".