20040402143 has 4 divisors (see below), whose sum is σ = 20056709640. Its totient is φ = 20024094648.

The previous prime is 20040402131. The next prime is 20040402149. The reversal of 20040402143 is 34120404002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20040402143 - 2⁶ = 20040402079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040402149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8151905 + ... + 8154362.

It is an arithmetic number, because the mean of its divisors is an integer number (5014177410).

Almost surely, 2^20040402143 is an apocalyptic number.

20040402143 is a deficient number, since it is larger than the sum of its proper divisors (16307497).

20040402143 is a wasteful number, since it uses less digits than its factorization.

20040402143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307496.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20040402143 its reverse (34120404002), we get a palindrome (54160806145).

The spelling of 20040402143 in words is "twenty billion, forty million, four hundred two thousand, one hundred forty-three".