20972937515 has 8 divisors (see below), whose sum is σ = 25208318880. Its totient is φ = 16751154112.

The previous prime is 20972937509. The next prime is 20972937529. The reversal of 20972937515 is 51573927902.

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 20972937515 - 2²⁸ = 20704502059 is a prime.

It is a super-3 number, since 3×20972937515³ (a number of 32 digits) contains 333 as substring.

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, 3396095 + ... + 3402264.

It is an arithmetic number, because the mean of its divisors is an integer number (3151039860).

Almost surely, 2^20972937515 is an apocalyptic number.

20972937515 is a deficient number, since it is larger than the sum of its proper divisors (4235381365).

20972937515 is an equidigital number, since it uses as much as digits as its factorization.

20972937515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6798981.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 20972937515 in words is "twenty billion, nine hundred seventy-two million, nine hundred thirty-seven thousand, five hundred fifteen".