20010123403 has 2 divisors, whose sum is σ = 20010123404. Its totient is φ = 20010123402.

The previous prime is 20010123373. The next prime is 20010123409. The reversal of 20010123403 is 30432101002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20010123403 - 2¹³ = 20010115211 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010123409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005061701 + 10005061702.

It is an arithmetic number, because the mean of its divisors is an integer number (10005061702).

Almost surely, 2^20010123403 is an apocalyptic number.

20010123403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010123403 is an equidigital number, since it uses as much as digits as its factorization.

20010123403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20010123403 its reverse (30432101002), we get a palindrome (50442224405).

The spelling of 20010123403 in words is "twenty billion, ten million, one hundred twenty-three thousand, four hundred three".