20970391347 has 60 divisors (see below), whose sum is σ = 33247986200. Its totient is φ = 13062757680.

The previous prime is 20970391301. The next prime is 20970391363. The reversal of 20970391347 is 74319307902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

20970391347 is a `hidden beast` number, since 209 + 70 + 39 + 1 + 347 = 666.

It is not a de Polignac number, because 20970391347 - 2¹⁹ = 20969867059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20970391147) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 676464222 + ... + 676464252.

Almost surely, 2^20970391347 is an apocalyptic number.

20970391347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20970391347 is a deficient number, since it is larger than the sum of its proper divisors (12277594853).

20970391347 is an frugal number, since it uses more digits than its factorization.

20970391347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 20970391347 in words is "twenty billion, nine hundred seventy million, three hundred ninety-one thousand, three hundred forty-seven".