20505441 has 16 divisors (see below), whose sum is σ = 29917440. Its totient is φ = 12389520.

The previous prime is 20505431. The next prime is 20505449. The reversal of 20505441 is 14450502.

It is not a de Polignac number, because 20505441 - 2⁵ = 20505409 is a prime.

It is a super-2 number, since 2×20505441² = 840946221208962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20505449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13086 + ... + 14568.

It is an arithmetic number, because the mean of its divisors is an integer number (1869840).

Almost surely, 2^20505441 is an apocalyptic number.

It is an amenable number.

20505441 is a deficient number, since it is larger than the sum of its proper divisors (9411999).

20505441 is a wasteful number, since it uses less digits than its factorization.

20505441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20505441 is about 4528.2933871382. The cubic root of 20505441 is about 273.7093949490.

Adding to 20505441 its reverse (14450502), we get a palindrome (34955943).

The spelling of 20505441 in words is "twenty million, five hundred five thousand, four hundred forty-one".