20394693784 has 32 divisors (see below), whose sum is σ = 40934952000. Its totient is φ = 9496900512.

The previous prime is 20394693769. The next prime is 20394693811. The reversal of 20394693784 is 48739649302.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1128114 + ... + 1146049.

It is an arithmetic number, because the mean of its divisors is an integer number (1279217250).

Almost surely, 2^20394693784 is an apocalyptic number.

It is an amenable number.

20394693784 is an abundant number, since it is smaller than the sum of its proper divisors (20540258216).

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

20394693784 is a wasteful number, since it uses less digits than its factorization.

20394693784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274247 (or 2274243 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 20394693784 in words is "twenty billion, three hundred ninety-four million, six hundred ninety-three thousand, seven hundred eighty-four".