20920706437 has 2 divisors, whose sum is σ = 20920706438. Its totient is φ = 20920706436.

The previous prime is 20920706369. The next prime is 20920706479. The reversal of 20920706437 is 73460702902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20876204196 + 44502241 = 144486^2 + 6671^2 .

It is a cyclic number.

It is not a de Polignac number, because 20920706437 - 2³¹ = 18773222789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20920706437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20920701437) 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, 10460353218 + 10460353219.

It is an arithmetic number, because the mean of its divisors is an integer number (10460353219).

Almost surely, 2^20920706437 is an apocalyptic number.

It is an amenable number.

20920706437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20920706437 is an equidigital number, since it uses as much as digits as its factorization.

20920706437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 20920706437 in words is "twenty billion, nine hundred twenty million, seven hundred six thousand, four hundred thirty-seven".