20952815 has 8 divisors (see below), whose sum is σ = 27077568. Its totient is φ = 15472800.

The previous prime is 20952809. The next prime is 20952817. The reversal of 20952815 is 51825902.

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

It is not a de Polignac number, because 20952815 - 2⁶ = 20952751 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 (20952817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161111 + ... + 161240.

It is an arithmetic number, because the mean of its divisors is an integer number (3384696).

Almost surely, 2^20952815 is an apocalyptic number.

20952815 is a deficient number, since it is larger than the sum of its proper divisors (6124753).

20952815 is a wasteful number, since it uses less digits than its factorization.

20952815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322369.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20952815 is about 4577.4244941888. The cubic root of 20952815 is about 275.6856280195.

The spelling of 20952815 in words is "twenty million, nine hundred fifty-two thousand, eight hundred fifteen".