20128021504 has 22 divisors (see below), whose sum is σ = 40236388784. Its totient is φ = 10064010240.

The previous prime is 20128021483. The next prime is 20128021541. The reversal of 20128021504 is 40512082102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9827112 + ... + 9829159.

Almost surely, 2^20128021504 is an apocalyptic number.

It is an amenable number.

20128021504 is a deficient number, since it is larger than the sum of its proper divisors (20108367280).

20128021504 is an equidigital number, since it uses as much as digits as its factorization.

20128021504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19656291 (or 19656273 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

It can be divided in two parts, 201280 and 21504, that added together give a square (222784 = 472²).

The spelling of 20128021504 in words is "twenty billion, one hundred twenty-eight million, twenty-one thousand, five hundred four".