20554997097 has 4 divisors (see below), whose sum is σ = 27406662800. Its totient is φ = 13703331396.

The previous prime is 20554997093. The next prime is 20554997101. The reversal of 20554997097 is 79079945502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20554997093) and next prime (20554997101).

It is not a de Polignac number, because 20554997097 - 2² = 20554997093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20554997093) 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 3 ways as a sum of consecutive naturals, for example, 3425832847 + ... + 3425832852.

It is an arithmetic number, because the mean of its divisors is an integer number (6851665700).

Almost surely, 2^20554997097 is an apocalyptic number.

It is an amenable number.

20554997097 is a deficient number, since it is larger than the sum of its proper divisors (6851665703).

20554997097 is an equidigital number, since it uses as much as digits as its factorization.

20554997097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851665702.

The product of its (nonzero) digits is 7144200, while the sum is 57.

The spelling of 20554997097 in words is "twenty billion, five hundred fifty-four million, nine hundred ninety-seven thousand, ninety-seven".