20992427397 has 8 divisors (see below), whose sum is σ = 31099892480. Its totient is φ = 13994951580.

The previous prime is 20992427371. The next prime is 20992427399. The reversal of 20992427397 is 79372429902.

20992427397 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 242 + 7 + 397 = 666.

It is not a de Polignac number, because 20992427397 - 2¹² = 20992423301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20992427399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388748629 + ... + 388748682.

It is an arithmetic number, because the mean of its divisors is an integer number (3887486560).

Almost surely, 2^20992427397 is an apocalyptic number.

20992427397 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20992427397 is a deficient number, since it is larger than the sum of its proper divisors (10107465083).

20992427397 is an equidigital number, since it uses as much as digits as its factorization.

20992427397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777497320 (or 777497314 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 20992427397 in words is "twenty billion, nine hundred ninety-two million, four hundred twenty-seven thousand, three hundred ninety-seven".