20349394380 has 72 divisors (see below), whose sum is σ = 70544571552. Its totient is φ = 4651289856.

The previous prime is 20349394379. The next prime is 20349394381. The reversal of 20349394380 is 8349394302.

20349394380 is a `hidden beast` number, since 203 + 4 + 9 + 3 + 9 + 438 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20349394379) and next prime (20349394381).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20349394381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8073897 + ... + 8076416.

It is an arithmetic number, because the mean of its divisors is an integer number (979785716).

Almost surely, 2^20349394380 is an apocalyptic number.

20349394380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20349394380 is an abundant number, since it is smaller than the sum of its proper divisors (50195177172).

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

20349394380 is a wasteful number, since it uses less digits than its factorization.

20349394380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16150335 (or 16150330 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 20349394380 in words is "twenty billion, three hundred forty-nine million, three hundred ninety-four thousand, three hundred eighty".