20406631403 has 2 divisors, whose sum is σ = 20406631404. Its totient is φ = 20406631402.

The previous prime is 20406631391. The next prime is 20406631439. The reversal of 20406631403 is 30413660402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20406631403 - 2²⁴ = 20389854187 is a prime.

It is a super-3 number, since 3×20406631403³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20406631493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203315701 + 10203315702.

It is an arithmetic number, because the mean of its divisors is an integer number (10203315702).

Almost surely, 2^20406631403 is an apocalyptic number.

20406631403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20406631403 is an equidigital number, since it uses as much as digits as its factorization.

20406631403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 20406631403 in words is "twenty billion, four hundred six million, six hundred thirty-one thousand, four hundred three".