20402733 has 16 divisors (see below), whose sum is σ = 29380736. Its totient is φ = 12519360.

The previous prime is 20402717. The next prime is 20402741. The reversal of 20402733 is 33720402.

It is a happy number.

It is not a de Polignac number, because 20402733 - 2⁴ = 20402717 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 (20402233) 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, 20616 + ... + 21582.

It is an arithmetic number, because the mean of its divisors is an integer number (1836296).

Almost surely, 2^20402733 is an apocalyptic number.

It is an amenable number.

20402733 is a deficient number, since it is larger than the sum of its proper divisors (8978003).

20402733 is a wasteful number, since it uses less digits than its factorization.

20402733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20402733 is about 4516.9384543073. The cubic root of 20402733 is about 273.2516430808.

It can be divided in two parts, 20 and 402733, that added together give a triangular number (402753 = T₈₉₇).

The spelling of 20402733 in words is "twenty million, four hundred two thousand, seven hundred thirty-three".