20687274469 has 2 divisors, whose sum is σ = 20687274470. Its totient is φ = 20687274468.

The previous prime is 20687274457. The next prime is 20687274523. The reversal of 20687274469 is 96447278602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16122650625 + 4564623844 = 126975^2 + 67562^2 .

It is a cyclic number.

It is not a de Polignac number, because 20687274469 - 2⁵ = 20687274437 is a prime.

It is a super-2 number, since 2×20687274469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20687274409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343637234 + 10343637235.

It is an arithmetic number, because the mean of its divisors is an integer number (10343637235).

Almost surely, 2^20687274469 is an apocalyptic number.

It is an amenable number.

20687274469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20687274469 is an equidigital number, since it uses as much as digits as its factorization.

20687274469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 20687274469 in words is "twenty billion, six hundred eighty-seven million, two hundred seventy-four thousand, four hundred sixty-nine".