20402067 has 16 divisors (see below), whose sum is σ = 32725760. Its totient is φ = 11044512.

The previous prime is 20402021. The next prime is 20402087. The reversal of 20402067 is 76020402.

It is a happy number.

It is not a de Polignac number, because 20402067 - 2¹¹ = 20400019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25168 + ... + 25965.

It is an arithmetic number, because the mean of its divisors is an integer number (2045360).

Almost surely, 2^20402067 is an apocalyptic number.

20402067 is a deficient number, since it is larger than the sum of its proper divisors (12323693).

20402067 is a wasteful number, since it uses less digits than its factorization.

20402067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51162.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20402067 is about 4516.8647312046. The cubic root of 20402067 is about 273.2486698260.

Adding to 20402067 its reverse (76020402), we get a palindrome (96422469).

The spelling of 20402067 in words is "twenty million, four hundred two thousand, sixty-seven".