20406002 has 4 divisors (see below), whose sum is σ = 30609006. Its totient is φ = 10203000.

The previous prime is 20405993. The next prime is 20406011. The reversal of 20406002 is 20060402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20405993) and next prime (20406011).

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 8288641 = 3481^2 + 2879^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101499 + ... + 5101502.

Almost surely, 2^20406002 is an apocalyptic number.

20406002 is a deficient number, since it is larger than the sum of its proper divisors (10203004).

20406002 is a wasteful number, since it uses less digits than its factorization.

20406002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203003.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20406002 is about 4517.3002999579. The cubic root of 20406002 is about 273.2662360918.

Adding to 20406002 its reverse (20060402), we get a palindrome (40466404).

The spelling of 20406002 in words is "twenty million, four hundred six thousand, two".