20497979345 has 8 divisors (see below), whose sum is σ = 24599508864. Its totient is φ = 16397094384.

The previous prime is 20497979321. The next prime is 20497979351. The reversal of 20497979345 is 54397979402.

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 20497979345 - 2¹⁰ = 20497978321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88169 + ... + 220838.

It is an arithmetic number, because the mean of its divisors is an integer number (3074938608).

Almost surely, 2^20497979345 is an apocalyptic number.

It is an amenable number.

20497979345 is a deficient number, since it is larger than the sum of its proper divisors (4101529519).

20497979345 is a wasteful number, since it uses less digits than its factorization.

20497979345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322279.

The product of its (nonzero) digits is 17146080, while the sum is 59.

The spelling of 20497979345 in words is "twenty billion, four hundred ninety-seven million, nine hundred seventy-nine thousand, three hundred forty-five".