20732470397 has 2 divisors, whose sum is σ = 20732470398. Its totient is φ = 20732470396.

The previous prime is 20732470393. The next prime is 20732470477. The reversal of 20732470397 is 79307423702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15692322361 + 5040148036 = 125269^2 + 70994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20732470397 - 2² = 20732470393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20732470391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366235198 + 10366235199.

It is an arithmetic number, because the mean of its divisors is an integer number (10366235199).

Almost surely, 2^20732470397 is an apocalyptic number.

It is an amenable number.

20732470397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20732470397 is an equidigital number, since it uses as much as digits as its factorization.

20732470397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 44.

The spelling of 20732470397 in words is "twenty billion, seven hundred thirty-two million, four hundred seventy thousand, three hundred ninety-seven".