20158451 has 8 divisors (see below), whose sum is σ = 21418320. Its totient is φ = 18936288.

The previous prime is 20158433. The next prime is 20158477. The reversal of 20158451 is 15485102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20158451 - 2²² = 15964147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20158451.

It is not an unprimeable number, because it can be changed into a prime (20158421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8321 + ... + 10466.

It is an arithmetic number, because the mean of its divisors is an integer number (2677290).

Almost surely, 2^20158451 is an apocalyptic number.

20158451 is a deficient number, since it is larger than the sum of its proper divisors (1259869).

20158451 is a wasteful number, since it uses less digits than its factorization.

20158451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18853.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 20158451 is about 4489.8163659553. The cubic root of 20158451 is about 272.1567138652.

The spelling of 20158451 in words is "twenty million, one hundred fifty-eight thousand, four hundred fifty-one".