20402073 has 6 divisors (see below), whose sum is σ = 29469674. Its totient is φ = 13601376.

The previous prime is 20402021. The next prime is 20402087. The reversal of 20402073 is 37020402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18249984 + 2152089 = 4272^2 + 1467^2 .

It is not a de Polignac number, because 20402073 - 2⁶ = 20402009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20403073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1133440 + ... + 1133457.

Almost surely, 2^20402073 is an apocalyptic number.

It is an amenable number.

20402073 is a deficient number, since it is larger than the sum of its proper divisors (9067601).

20402073 is a wasteful number, since it uses less digits than its factorization.

20402073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266903 (or 2266900 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20402073 is about 4516.8653953821. The cubic root of 20402073 is about 273.2486966123.

Adding to 20402073 its reverse (37020402), we get a palindrome (57422475).

The spelling of 20402073 in words is "twenty million, four hundred two thousand, seventy-three".