20696519540 has 24 divisors (see below), whose sum is σ = 44012855040. Its totient is φ = 8173814688.

The previous prime is 20696519537. The next prime is 20696519603. The reversal of 20696519540 is 4591569602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6547952 + ... + 6551111.

It is an arithmetic number, because the mean of its divisors is an integer number (1833868960).

Almost surely, 2^20696519540 is an apocalyptic number.

20696519540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20696519540 is an abundant number, since it is smaller than the sum of its proper divisors (23316335500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20696519540 is a wasteful number, since it uses less digits than its factorization.

20696519540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13099151 (or 13099149 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20696519540 in words is "twenty billion, six hundred ninety-six million, five hundred nineteen thousand, five hundred forty".