20402404 has 24 divisors (see below), whose sum is σ = 39344256. Its totient is φ = 9180000.

The previous prime is 20402387. The next prime is 20402407. The reversal of 20402404 is 40420402.

It is not an unprimeable number, because it can be changed into a prime (20402407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2149 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (1639344).

Almost surely, 2^20402404 is an apocalyptic number.

It is an amenable number.

20402404 is a deficient number, since it is larger than the sum of its proper divisors (18941852).

20402404 is a wasteful number, since it uses less digits than its factorization.

20402404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707 (or 4705 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20402404 is about 4516.9020356877. The cubic root of 20402404 is about 273.2501743189.

Adding to 20402404 its reverse (40420402), we get a palindrome (60822806).

It can be divided in two parts, 20402 and 404, that multiplied together give a cube (8242408 = 202³).

The spelling of 20402404 in words is "twenty million, four hundred two thousand, four hundred four".