20523534420 has 48 divisors (see below), whose sum is σ = 57552945408. Its totient is φ = 5464652160.

The previous prime is 20523534389. The next prime is 20523534439. The reversal of 20523534420 is 2443532502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219084 + ... + 298403.

It is an arithmetic number, because the mean of its divisors is an integer number (1199019696).

Almost surely, 2^20523534420 is an apocalyptic number.

20523534420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20523534420 is an abundant number, since it is smaller than the sum of its proper divisors (37029410988).

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

20523534420 is a wasteful number, since it uses less digits than its factorization.

20523534420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518160 (or 518158 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 30.

The spelling of 20523534420 in words is "twenty billion, five hundred twenty-three million, five hundred thirty-four thousand, four hundred twenty".