20451051 has 24 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 12761856.

The previous prime is 20451037. The next prime is 20451059. The reversal of 20451051 is 15015402.

It is not a de Polignac number, because 20451051 - 2¹⁵ = 20418283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20451059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53206 + ... + 53588.

It is an arithmetic number, because the mean of its divisors is an integer number (1310400).

Almost surely, 2^20451051 is an apocalyptic number.

20451051 is a deficient number, since it is larger than the sum of its proper divisors (10998549).

20451051 is a wasteful number, since it uses less digits than its factorization.

20451051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20451051 is about 4522.2838256792. The cubic root of 20451051 is about 273.4671789782.

Adding to 20451051 its reverse (15015402), we get a palindrome (35466453).

The spelling of 20451051 in words is "twenty million, four hundred fifty-one thousand, fifty-one".