20841451 has 4 divisors (see below), whose sum is σ = 21047904. Its totient is φ = 20635000.

The previous prime is 20841421. The next prime is 20841463. The reversal of 20841451 is 15414802.

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

It is a cyclic number.

It is not a de Polignac number, because 20841451 - 2⁵ = 20841419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20841421) 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, 103075 + ... + 103276.

It is an arithmetic number, because the mean of its divisors is an integer number (5261976).

Almost surely, 2^20841451 is an apocalyptic number.

20841451 is a deficient number, since it is larger than the sum of its proper divisors (206453).

20841451 is a wasteful number, since it uses less digits than its factorization.

20841451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206452.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20841451 is about 4565.2438050996. The cubic root of 20841451 is about 275.1963380268.

The spelling of 20841451 in words is "twenty million, eight hundred forty-one thousand, four hundred fifty-one".