20142405 has 32 divisors (see below), whose sum is σ = 36971520. Its totient is φ = 10393920.

The previous prime is 20142401. The next prime is 20142427. The reversal of 20142405 is 50424102.

It is not a de Polignac number, because 20142405 - 2² = 20142401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20142401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1779 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1155360).

Almost surely, 2^20142405 is an apocalyptic number.

It is an amenable number.

20142405 is a deficient number, since it is larger than the sum of its proper divisors (16829115).

20142405 is a wasteful number, since it uses less digits than its factorization.

20142405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858 (or 4852 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20142405 is about 4488.0290774459. The cubic root of 20142405 is about 272.0844830202.

Adding to 20142405 its reverse (50424102), we get a palindrome (70566507).

The spelling of 20142405 in words is "twenty million, one hundred forty-two thousand, four hundred five".