20502406 has 16 divisors (see below), whose sum is σ = 32488560. Its totient is φ = 9676800.

The previous prime is 20502401. The next prime is 20502479. The reversal of 20502406 is 60420502.

20502406 is a nontrivial binomial coefficient, being equal to C(6404, 2).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502401) 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 7 ways as a sum of consecutive naturals, for example, 12006 + ... + 13606.

It is an arithmetic number, because the mean of its divisors is an integer number (2030535).

Almost surely, 2^20502406 is an apocalyptic number.

20502406 is the 6403-rd triangular number and also the 3202-nd hexagonal number.

20502406 is the 2135-th centered nonagonal number.

20502406 is a deficient number, since it is larger than the sum of its proper divisors (11986154).

20502406 is a wasteful number, since it uses less digits than its factorization.

20502406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20502406 is about 4527.9582595249. The cubic root of 20502406 is about 273.6958904195.

Adding to 20502406 its reverse (60420502), we get a palindrome (80922908).

The spelling of 20502406 in words is "twenty million, five hundred two thousand, four hundred six".