20212451 has 24 divisors (see below), whose sum is σ = 24648624. Its totient is φ = 16511040.

The previous prime is 20212421. The next prime is 20212453. The reversal of 20212451 is 15421202.

It is not a de Polignac number, because 20212451 - 2²² = 16018147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20212453) 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, 111581 + ... + 111761.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026).

Almost surely, 2^20212451 is an apocalyptic number.

20212451 is a deficient number, since it is larger than the sum of its proper divisors (4436173).

20212451 is a wasteful number, since it uses less digits than its factorization.

20212451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20212451 is about 4495.8259530369. The cubic root of 20212451 is about 272.3995129307.

Adding to 20212451 its reverse (15421202), we get a palindrome (35633653).

The spelling of 20212451 in words is "twenty million, two hundred twelve thousand, four hundred fifty-one".