20451901 has 8 divisors (see below), whose sum is σ = 21700224. Its totient is φ = 19208640.

The previous prime is 20451877. The next prime is 20451911. The reversal of 20451901 is 10915402.

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

It is not a de Polignac number, because 20451901 - 2¹⁷ = 20320829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9996 + ... + 11866.

It is an arithmetic number, because the mean of its divisors is an integer number (2712528).

Almost surely, 2^20451901 is an apocalyptic number.

It is an amenable number.

20451901 is a deficient number, since it is larger than the sum of its proper divisors (1248323).

20451901 is a wasteful number, since it uses less digits than its factorization.

20451901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20451901 is about 4522.3778037665. The cubic root of 20451901 is about 273.4709675999.

The spelling of 20451901 in words is "twenty million, four hundred fifty-one thousand, nine hundred one".