20157405 has 16 divisors (see below), whose sum is σ = 32311104. Its totient is φ = 10730880.

The previous prime is 20157391. The next prime is 20157413. The reversal of 20157405 is 50475102.

It is not a de Polignac number, because 20157405 - 2⁸ = 20157149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11337 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (2019444).

Almost surely, 2^20157405 is an apocalyptic number.

It is an amenable number.

20157405 is a deficient number, since it is larger than the sum of its proper divisors (12153699).

20157405 is a wasteful number, since it uses less digits than its factorization.

20157405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20157405 is about 4489.6998786110. The cubic root of 20157405 is about 272.1520064790.

The spelling of 20157405 in words is "twenty million, one hundred fifty-seven thousand, four hundred five".