20138600409 has 16 divisors (see below), whose sum is σ = 26962253760. Its totient is φ = 13370448960.

The previous prime is 20138600407. The next prime is 20138600423. The reversal of 20138600409 is 90400683102.

It is not a de Polignac number, because 20138600409 - 2¹ = 20138600407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20138600409.

It is not an unprimeable number, because it can be changed into a prime (20138600407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758334 + ... + 784440.

It is an arithmetic number, because the mean of its divisors is an integer number (1685140860).

Almost surely, 2^20138600409 is an apocalyptic number.

It is an amenable number.

20138600409 is a deficient number, since it is larger than the sum of its proper divisors (6823653351).

20138600409 is a wasteful number, since it uses less digits than its factorization.

20138600409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27160.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 20138600409 in words is "twenty billion, one hundred thirty-eight million, six hundred thousand, four hundred nine".