20700621 has 12 divisors (see below), whose sum is σ = 31201248. Its totient is φ = 13200264.

The previous prime is 20700593. The next prime is 20700623. The reversal of 20700621 is 12600702.

It is a happy number.

It is not a de Polignac number, because 20700621 - 2⁹ = 20700109 is a prime.

20700621 is a modest number, since divided by 621 gives 207 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20700594 and 20700603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700623) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 49795 + ... + 50208.

It is an arithmetic number, because the mean of its divisors is an integer number (2600104).

Almost surely, 2^20700621 is an apocalyptic number.

It is an amenable number.

20700621 is a deficient number, since it is larger than the sum of its proper divisors (10500627).

20700621 is a wasteful number, since it uses less digits than its factorization.

20700621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100032 (or 100029 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20700621 is about 4549.7935117981. The cubic root of 20700621 is about 274.5750837236.

It can be divided in two parts, 20700 and 621, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20700621 in words is "twenty million, seven hundred thousand, six hundred twenty-one".