20621773 has 8 divisors (see below), whose sum is σ = 20880000. Its totient is φ = 20365488.

The previous prime is 20621771. The next prime is 20621791. The reversal of 20621773 is 37712602.

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 20621773 - 2¹ = 20621771 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 (20621771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34128 + ... + 34726.

It is an arithmetic number, because the mean of its divisors is an integer number (2610000).

Almost surely, 2^20621773 is an apocalyptic number.

It is an amenable number.

20621773 is a deficient number, since it is larger than the sum of its proper divisors (258227).

20621773 is a wasteful number, since it uses less digits than its factorization.

20621773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20621773 is about 4541.1202362413. The cubic root of 20621773 is about 274.2260242730.

The spelling of 20621773 in words is "twenty million, six hundred twenty-one thousand, seven hundred seventy-three".