20400134 has 4 divisors (see below), whose sum is σ = 30600204. Its totient is φ = 10200066.

The previous prime is 20400101. The next prime is 20400151. The reversal of 20400134 is 43100402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43100402 = 2 ⋅21550201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100032 + ... + 5100035.

It is an arithmetic number, because the mean of its divisors is an integer number (7650051).

Almost surely, 2^20400134 is an apocalyptic number.

20400134 is a deficient number, since it is larger than the sum of its proper divisors (10200070).

20400134 is a wasteful number, since it uses less digits than its factorization.

20400134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200069.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20400134 is about 4516.6507502795. The cubic root of 20400134 is about 273.2400398775.

Adding to 20400134 its reverse (43100402), we get a palindrome (63500536).

The spelling of 20400134 in words is "twenty million, four hundred thousand, one hundred thirty-four".