20423690394 has 16 divisors (see below), whose sum is σ = 42255911520. Its totient is φ = 6573141680.

The previous prime is 20423690393. The next prime is 20423690407. The reversal of 20423690394 is 49309632402.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20423690393) 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, 58688592 + ... + 58688939.

It is an arithmetic number, because the mean of its divisors is an integer number (2640994470).

Almost surely, 2^20423690394 is an apocalyptic number.

20423690394 is an abundant number, since it is smaller than the sum of its proper divisors (21832221126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423690394 is a wasteful number, since it uses less digits than its factorization.

20423690394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117377565.

The product of its (nonzero) digits is 279936, while the sum is 42.

The spelling of 20423690394 in words is "twenty billion, four hundred twenty-three million, six hundred ninety thousand, three hundred ninety-four".