20621733 has 16 divisors (see below), whose sum is σ = 30291456. Its totient is φ = 12374640.

The previous prime is 20621693. The next prime is 20621759. The reversal of 20621733 is 33712602.

It is not a de Polignac number, because 20621733 - 2¹⁰ = 20620709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621333) 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 15 ways as a sum of consecutive naturals, for example, 366 + ... + 6432.

It is an arithmetic number, because the mean of its divisors is an integer number (1893216).

Almost surely, 2^20621733 is an apocalyptic number.

It is an amenable number.

20621733 is a deficient number, since it is larger than the sum of its proper divisors (9669723).

20621733 is a wasteful number, since it uses less digits than its factorization.

20621733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6184.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20621733 is about 4541.1158320395. The cubic root of 20621733 is about 274.2258469677.

The spelling of 20621733 in words is "twenty million, six hundred twenty-one thousand, seven hundred thirty-three".