20356742464 has 28 divisors (see below), whose sum is σ = 40662949408. Its totient is φ = 10110960000.

The previous prime is 20356742437. The next prime is 20356742467. The reversal of 20356742464 is 46424765302.

It is a self number, because there is not a number n which added to its sum of digits gives 20356742464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356742467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043562 + ... + 1062889.

Almost surely, 2^20356742464 is an apocalyptic number.

It is an amenable number.

20356742464 is a deficient number, since it is larger than the sum of its proper divisors (20306206944).

20356742464 is a wasteful number, since it uses less digits than its factorization.

20356742464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106614 (or 2106604 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 43.

The spelling of 20356742464 in words is "twenty billion, three hundred fifty-six million, seven hundred forty-two thousand, four hundred sixty-four".