21620485 has 8 divisors (see below), whose sum is σ = 26781696. Its totient is φ = 16738320.

The previous prime is 21620479. The next prime is 21620497. The reversal of 21620485 is 58402612.

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

It is not a de Polignac number, because 21620485 - 2⁵ = 21620453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69589 + ... + 69898.

It is an arithmetic number, because the mean of its divisors is an integer number (3347712).

Almost surely, 2^21620485 is an apocalyptic number.

It is an amenable number.

21620485 is a deficient number, since it is larger than the sum of its proper divisors (5161211).

21620485 is a wasteful number, since it uses less digits than its factorization.

21620485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139523.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21620485 is about 4649.7833282853. The cubic root of 21620485 is about 278.5833419657.

The spelling of 21620485 in words is "twenty-one million, six hundred twenty thousand, four hundred eighty-five".