20675479797 has 48 divisors (see below), whose sum is σ = 35435417472. Its totient is φ = 11801090880.

The previous prime is 20675479789. The next prime is 20675479813. The reversal of 20675479797 is 79797457602.

20675479797 is a `hidden beast` number, since 2 + 0 + 6 + 75 + 479 + 7 + 97 = 666.

It is not a de Polignac number, because 20675479797 - 2³ = 20675479789 is a prime.

It is a super-2 number, since 2×20675479797² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675479597) 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 47 ways as a sum of consecutive naturals, for example, 1594183 + ... + 1607099.

It is an arithmetic number, because the mean of its divisors is an integer number (738237864).

Almost surely, 2^20675479797 is an apocalyptic number.

20675479797 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20675479797 is a deficient number, since it is larger than the sum of its proper divisors (14759937675).

20675479797 is an equidigital number, since it uses as much as digits as its factorization.

20675479797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880 (or 13868 counting only the distinct ones).

The product of its (nonzero) digits is 46675440, while the sum is 63.

The spelling of 20675479797 in words is "twenty billion, six hundred seventy-five million, four hundred seventy-nine thousand, seven hundred ninety-seven".