20497212646 has 8 divisors (see below), whose sum is σ = 30764245680. Its totient is φ = 10242464088.

The previous prime is 20497212623. The next prime is 20497212653. The reversal of 20497212646 is 64621279402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3066946 + ... + 3073621.

It is an arithmetic number, because the mean of its divisors is an integer number (3845530710).

Almost surely, 2^20497212646 is an apocalyptic number.

20497212646 is a deficient number, since it is larger than the sum of its proper divisors (10267033034).

20497212646 is a wasteful number, since it uses less digits than its factorization.

20497212646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142238.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 20497212646 in words is "twenty billion, four hundred ninety-seven million, two hundred twelve thousand, six hundred forty-six".