20870403629 has 2 divisors, whose sum is σ = 20870403630. Its totient is φ = 20870403628.

The previous prime is 20870403571. The next prime is 20870403647. The reversal of 20870403629 is 92630407802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17187734404 + 3682669225 = 131102^2 + 60685^2 .

It is a cyclic number.

It is not a de Polignac number, because 20870403629 - 2⁸ = 20870403373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20870406629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435201814 + 10435201815.

It is an arithmetic number, because the mean of its divisors is an integer number (10435201815).

Almost surely, 2^20870403629 is an apocalyptic number.

It is an amenable number.

20870403629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870403629 is an equidigital number, since it uses as much as digits as its factorization.

20870403629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 20870403629 in words is "twenty billion, eight hundred seventy million, four hundred three thousand, six hundred twenty-nine".