20621653 has 8 divisors (see below), whose sum is σ = 22251488. Its totient is φ = 18998064.

The previous prime is 20621609. The next prime is 20621677. The reversal of 20621653 is 35612602.

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 20621653 - 2⁹ = 20621141 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 (20621683) 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 7 ways as a sum of consecutive naturals, for example, 7126 + ... + 9592.

It is an arithmetic number, because the mean of its divisors is an integer number (2781436).

Almost surely, 2^20621653 is an apocalyptic number.

It is an amenable number.

20621653 is a deficient number, since it is larger than the sum of its proper divisors (1629835).

20621653 is a wasteful number, since it uses less digits than its factorization.

20621653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20621653 is about 4541.1070236232. The cubic root of 20621653 is about 274.2254923565.

The spelling of 20621653 in words is "twenty million, six hundred twenty-one thousand, six hundred fifty-three".