20445702615 has 64 divisors (see below), whose sum is σ = 39278494080. Its totient is φ = 10030970880.

The previous prime is 20445702559. The next prime is 20445702671. The reversal of 20445702615 is 51620754402.

It is a happy number.

20445702615 is a `hidden beast` number, since 20 + 4 + 4 + 570 + 2 + 61 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20445702559) and next prime (20445702671).

It is not a de Polignac number, because 20445702615 - 2¹¹ = 20445700567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20445702615.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 494335 + ... + 534095.

It is an arithmetic number, because the mean of its divisors is an integer number (613726470).

Almost surely, 2^20445702615 is an apocalyptic number.

20445702615 is a deficient number, since it is larger than the sum of its proper divisors (18832791465).

20445702615 is a wasteful number, since it uses less digits than its factorization.

20445702615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40081 (or 40075 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 20445702615 in words is "twenty billion, four hundred forty-five million, seven hundred two thousand, six hundred fifteen".