20400613693 has 8 divisors (see below), whose sum is σ = 20602403640. Its totient is φ = 20199590400.

The previous prime is 20400613691. The next prime is 20400613763. The reversal of 20400613693 is 39631600402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3760387684 + 16640226009 = 61322^2 + 128997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400613693 - 2¹ = 20400613691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400613691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138108 + ... + 244693.

It is an arithmetic number, because the mean of its divisors is an integer number (2575300455).

Almost surely, 2^20400613693 is an apocalyptic number.

It is an amenable number.

20400613693 is a deficient number, since it is larger than the sum of its proper divisors (201789947).

20400613693 is a wasteful number, since it uses less digits than its factorization.

20400613693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383327.

The product of its (nonzero) digits is 23328, while the sum is 34.

The spelling of 20400613693 in words is "twenty billion, four hundred million, six hundred thirteen thousand, six hundred ninety-three".