20606451 has 4 divisors (see below), whose sum is σ = 27475272. Its totient is φ = 13737632.

The previous prime is 20606429. The next prime is 20606461. The reversal of 20606451 is 15460602.

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 20606451 - 2⁵ = 20606419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20606461) 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, 3434406 + ... + 3434411.

It is an arithmetic number, because the mean of its divisors is an integer number (6868818).

Almost surely, 2^20606451 is an apocalyptic number.

20606451 is a deficient number, since it is larger than the sum of its proper divisors (6868821).

20606451 is an equidigital number, since it uses as much as digits as its factorization.

20606451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6868820.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20606451 is about 4539.4328940959. The cubic root of 20606451 is about 274.1580906995.

The spelling of 20606451 in words is "twenty million, six hundred six thousand, four hundred fifty-one".