20011510397 has 2 divisors, whose sum is σ = 20011510398. Its totient is φ = 20011510396.

The previous prime is 20011510369. The next prime is 20011510417. The reversal of 20011510397 is 79301511002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19468899961 + 542610436 = 139531^2 + 23294^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011510397 - 2¹⁰ = 20011509373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011510097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005755198 + 10005755199.

It is an arithmetic number, because the mean of its divisors is an integer number (10005755199).

Almost surely, 2^20011510397 is an apocalyptic number.

It is an amenable number.

20011510397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011510397 is an equidigital number, since it uses as much as digits as its factorization.

20011510397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The spelling of 20011510397 in words is "twenty billion, eleven million, five hundred ten thousand, three hundred ninety-seven".