20402143403 has 2 divisors, whose sum is σ = 20402143404. Its totient is φ = 20402143402.

The previous prime is 20402143381. The next prime is 20402143451. The reversal of 20402143403 is 30434120402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20402143403 - 2⁶ = 20402143339 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20402143103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201071701 + 10201071702.

It is an arithmetic number, because the mean of its divisors is an integer number (10201071702).

Almost surely, 2^20402143403 is an apocalyptic number.

20402143403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402143403 is an equidigital number, since it uses as much as digits as its factorization.

20402143403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20402143403 its reverse (30434120402), we get a palindrome (50836263805).

The spelling of 20402143403 in words is "twenty billion, four hundred two million, one hundred forty-three thousand, four hundred three".