20530421512 has 16 divisors (see below), whose sum is σ = 38739730860. Its totient is φ = 10199826624.

The previous prime is 20530421503. The next prime is 20530421521. The reversal of 20530421512 is 21512403502.

It is an interprime number because it is at equal distance from previous prime (20530421503) and next prime (20530421521).

It can be written as a sum of positive squares in 2 ways, for example, as 20094196516 + 436224996 = 141754^2 + 20886^2 .

It is a super-2 number, since 2×20530421512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8171683 + ... + 8174194.

Almost surely, 2^20530421512 is an apocalyptic number.

It is an amenable number.

20530421512 is a deficient number, since it is larger than the sum of its proper divisors (18209309348).

20530421512 is a wasteful number, since it uses less digits than its factorization.

20530421512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16346040 (or 16346036 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 20530421512 in words is "twenty billion, five hundred thirty million, four hundred twenty-one thousand, five hundred twelve".