20949400393 has 8 divisors (see below), whose sum is σ = 21673615680. Its totient is φ = 20225306640.

The previous prime is 20949400391. The next prime is 20949400403. The reversal of 20949400393 is 39300494902.

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 20949400393 - 2¹ = 20949400391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949400391) 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, 448446 + ... + 492952.

It is an arithmetic number, because the mean of its divisors is an integer number (2709201960).

Almost surely, 2^20949400393 is an apocalyptic number.

It is an amenable number.

20949400393 is a deficient number, since it is larger than the sum of its proper divisors (724215287).

20949400393 is a wasteful number, since it uses less digits than its factorization.

20949400393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60767.

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 20949400393 in words is "twenty billion, nine hundred forty-nine million, four hundred thousand, three hundred ninety-three".