20122451 has 4 divisors (see below), whose sum is σ = 20143632. Its totient is φ = 20101272.

The previous prime is 20122429. The next prime is 20122469. The reversal of 20122451 is 15422102.

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 20122451 - 2¹⁰ = 20121427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122051) 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, 9095 + ... + 11088.

It is an arithmetic number, because the mean of its divisors is an integer number (5035908).

Almost surely, 2^20122451 is an apocalyptic number.

20122451 is a deficient number, since it is larger than the sum of its proper divisors (21181).

20122451 is an equidigital number, since it uses as much as digits as its factorization.

20122451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21180.

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

The square root of 20122451 is about 4485.8055018023. The cubic root of 20122451 is about 271.9946068351.

Adding to 20122451 its reverse (15422102), we get a palindrome (35544553).

The spelling of 20122451 in words is "twenty million, one hundred twenty-two thousand, four hundred fifty-one".