20864006437 has 2 divisors, whose sum is σ = 20864006438. Its totient is φ = 20864006436.

The previous prime is 20864006377. The next prime is 20864006489. The reversal of 20864006437 is 73460046802.

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., 12912004161 + 7952002276 = 113631^2 + 89174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20864006437 - 2⁷ = 20864006309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20864006437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20864003437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432003218 + 10432003219.

It is an arithmetic number, because the mean of its divisors is an integer number (10432003219).

Almost surely, 2^20864006437 is an apocalyptic number.

It is an amenable number.

20864006437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20864006437 is an equidigital number, since it uses as much as digits as its factorization.

20864006437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 20864006437 in words is "twenty billion, eight hundred sixty-four million, six thousand, four hundred thirty-seven".