20837469409 has 2 divisors, whose sum is σ = 20837469410. Its totient is φ = 20837469408.

The previous prime is 20837469407. The next prime is 20837469421. The reversal of 20837469409 is 90496473802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20612919184 + 224550225 = 143572^2 + 14985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20837469409 - 2¹ = 20837469407 is a prime.

Together with 20837469407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20837469407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418734704 + 10418734705.

It is an arithmetic number, because the mean of its divisors is an integer number (10418734705).

Almost surely, 2^20837469409 is an apocalyptic number.

It is an amenable number.

20837469409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20837469409 is an equidigital number, since it uses as much as digits as its factorization.

20837469409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 20837469409 in words is "twenty billion, eight hundred thirty-seven million, four hundred sixty-nine thousand, four hundred nine".