20752421547 has 64 divisors (see below), whose sum is σ = 35398540800. Its totient is φ = 10619320320.

The previous prime is 20752421539. The next prime is 20752421551. The reversal of 20752421547 is 74512425702.

It is a happy number.

It is not a de Polignac number, because 20752421547 - 2³ = 20752421539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20752421597) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 192483 + ... + 280275.

It is an arithmetic number, because the mean of its divisors is an integer number (553102200).

Almost surely, 2^20752421547 is an apocalyptic number.

20752421547 is a deficient number, since it is larger than the sum of its proper divisors (14646119253).

20752421547 is a wasteful number, since it uses less digits than its factorization.

20752421547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87868.

The product of its (nonzero) digits is 156800, while the sum is 39.

The spelling of 20752421547 in words is "twenty billion, seven hundred fifty-two million, four hundred twenty-one thousand, five hundred forty-seven".