20467534521 has 32 divisors (see below), whose sum is σ = 32891161600. Its totient is φ = 11059571520.

The previous prime is 20467534511. The next prime is 20467534547. The reversal of 20467534521 is 12543576402.

It is not a de Polignac number, because 20467534521 - 2³⁰ = 19393792697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20467534521.

It is not an unprimeable number, because it can be changed into a prime (20467534511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168450 + ... + 263268.

It is an arithmetic number, because the mean of its divisors is an integer number (1027848800).

Almost surely, 2^20467534521 is an apocalyptic number.

20467534521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20467534521 is a deficient number, since it is larger than the sum of its proper divisors (12423627079).

20467534521 is a wasteful number, since it uses less digits than its factorization.

20467534521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95389.

The product of its (nonzero) digits is 201600, while the sum is 39.

The spelling of 20467534521 in words is "twenty billion, four hundred sixty-seven million, five hundred thirty-four thousand, five hundred twenty-one".