20530311456 has 48 divisors (see below), whose sum is σ = 54285475104. Its totient is φ = 6793480704.

The previous prime is 20530311437. The next prime is 20530311457. The reversal of 20530311456 is 65411303502.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (20530311457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767350 + ... + 793653.

It is an arithmetic number, because the mean of its divisors is an integer number (1130947398).

Almost surely, 2^20530311456 is an apocalyptic number.

It is an amenable number.

20530311456 is an abundant number, since it is smaller than the sum of its proper divisors (33755163648).

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

20530311456 is a wasteful number, since it uses less digits than its factorization.

20530311456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561153 (or 1561145 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 20530311456 its reverse (65411303502), we get a palindrome (85941614958).

The spelling of 20530311456 in words is "twenty billion, five hundred thirty million, three hundred eleven thousand, four hundred fifty-six".