20342551 has 8 divisors (see below), whose sum is σ = 20817360. Its totient is φ = 19872192.

The previous prime is 20342537. The next prime is 20342573. The reversal of 20342551 is 15524302.

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 20342551 - 2⁹ = 20342039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342501) 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, 9211 + ... + 11203.

It is an arithmetic number, because the mean of its divisors is an integer number (2602170).

Almost surely, 2^20342551 is an apocalyptic number.

20342551 is a deficient number, since it is larger than the sum of its proper divisors (474809).

20342551 is a wasteful number, since it uses less digits than its factorization.

20342551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20342551 is about 4510.2717213046. The cubic root of 20342551 is about 272.9827080962.

Adding to 20342551 its reverse (15524302), we get a palindrome (35866853).

The spelling of 20342551 in words is "twenty million, three hundred forty-two thousand, five hundred fifty-one".