20925751615 has 8 divisors (see below), whose sum is σ = 25123450608. Its totient is φ = 16732235520.

The previous prime is 20925751603. The next prime is 20925751633. The reversal of 20925751615 is 51615752902.

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

It is not a de Polignac number, because 20925751615 - 2²⁷ = 20791533887 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1034706 + ... + 1054735.

It is an arithmetic number, because the mean of its divisors is an integer number (3140431326).

Almost surely, 2^20925751615 is an apocalyptic number.

20925751615 is a deficient number, since it is larger than the sum of its proper divisors (4197698993).

20925751615 is a wasteful number, since it uses less digits than its factorization.

20925751615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091449.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 20925751615 in words is "twenty billion, nine hundred twenty-five million, seven hundred fifty-one thousand, six hundred fifteen".