20342951 has 4 divisors (see below), whose sum is σ = 20676504. Its totient is φ = 20009400.

The previous prime is 20342941. The next prime is 20342957. The reversal of 20342951 is 15924302.

20342951 = T₇₈₆ + T₇₈₇ + ... + T₈₄₆.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15924302 = 2 ⋅7962151.

It is a cyclic number.

It is not a de Polignac number, because 20342951 - 2⁶ = 20342887 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 20342951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342957) 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 3 ways as a sum of consecutive naturals, for example, 166685 + ... + 166806.

It is an arithmetic number, because the mean of its divisors is an integer number (5169126).

Almost surely, 2^20342951 is an apocalyptic number.

20342951 is a deficient number, since it is larger than the sum of its proper divisors (333553).

20342951 is an equidigital number, since it uses as much as digits as its factorization.

20342951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333552.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20342951 is about 4510.3160643130. The cubic root of 20342951 is about 272.9844973240.

The spelling of 20342951 in words is "twenty million, three hundred forty-two thousand, nine hundred fifty-one".