20279845397 has 8 divisors (see below), whose sum is σ = 23178057600. Its totient is φ = 17381906064.

The previous prime is 20279845393. The next prime is 20279845441. The reversal of 20279845397 is 79354897202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20279845397 - 2² = 20279845393 is a prime.

It is a super-2 number, since 2×20279845397² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279845393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129104 + ... + 239222.

It is an arithmetic number, because the mean of its divisors is an integer number (2897257200).

Almost surely, 2^20279845397 is an apocalyptic number.

It is an amenable number.

20279845397 is a deficient number, since it is larger than the sum of its proper divisors (2898212203).

20279845397 is a wasteful number, since it uses less digits than its factorization.

20279845397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136435.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 20279845397 in words is "twenty billion, two hundred seventy-nine million, eight hundred forty-five thousand, three hundred ninety-seven".