20402105 has 8 divisors (see below), whose sum is σ = 25771200. Its totient is φ = 15462576.

The previous prime is 20402099. The next prime is 20402119. The reversal of 20402105 is 50120402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20402105 - 2¹² = 20398009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20402105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107285 + ... + 107474.

It is an arithmetic number, because the mean of its divisors is an integer number (3221400).

Almost surely, 2^20402105 is an apocalyptic number.

It is an amenable number.

20402105 is a deficient number, since it is larger than the sum of its proper divisors (5369095).

20402105 is a wasteful number, since it uses less digits than its factorization.

20402105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214783.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20402105 is about 4516.8689376602. The cubic root of 20402105 is about 273.2488394729.

Adding to 20402105 its reverse (50120402), we get a palindrome (70522507).

The spelling of 20402105 in words is "twenty million, four hundred two thousand, one hundred five".