20653451 has 12 divisors (see below), whose sum is σ = 25874352. Its totient is φ = 16340688.

The previous prime is 20653447. The next prime is 20653469. The reversal of 20653451 is 15435602.

It is not a de Polignac number, because 20653451 - 2² = 20653447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20653451.

It is not an unprimeable number, because it can be changed into a prime (20653421) 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 11 ways as a sum of consecutive naturals, for example, 15575 + ... + 16848.

It is an arithmetic number, because the mean of its divisors is an integer number (2156196).

Almost surely, 2^20653451 is an apocalyptic number.

20653451 is a deficient number, since it is larger than the sum of its proper divisors (5220901).

20653451 is a wasteful number, since it uses less digits than its factorization.

20653451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32450 (or 32443 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20653451 is about 4544.6068036740. The cubic root of 20653451 is about 274.3663692644.

The spelling of 20653451 in words is "twenty million, six hundred fifty-three thousand, four hundred fifty-one".