21920495 has 8 divisors (see below), whose sum is σ = 27448416. Its totient is φ = 16773856.

The previous prime is 21920473. The next prime is 21920501. The reversal of 21920495 is 59402912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21920495 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95192 + ... + 95421.

It is an arithmetic number, because the mean of its divisors is an integer number (3431052).

Almost surely, 2^21920495 is an apocalyptic number.

21920495 is a deficient number, since it is larger than the sum of its proper divisors (5527921).

21920495 is a wasteful number, since it uses less digits than its factorization.

21920495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190641.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 21920495 is about 4681.9328273695. The cubic root of 21920495 is about 279.8659860384.

The spelling of 21920495 in words is "twenty-one million, nine hundred twenty thousand, four hundred ninety-five".