20420233524 has 18 divisors (see below), whose sum is σ = 51617812610. Its totient is φ = 6806744496.

The previous prime is 20420233517. The next prime is 20420233531. The reversal of 20420233524 is 42533202402.

It is a happy number.

20420233524 is a `hidden beast` number, since 2 + 0 + 420 + 233 + 5 + 2 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (20420233517) and next prime (20420233531).

It can be written as a sum of positive squares in only one way, i.e., 18297972900 + 2122260624 = 135270^2 + 46068^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283614319 + ... + 283614390.

Almost surely, 2^20420233524 is an apocalyptic number.

It is an amenable number.

20420233524 is an abundant number, since it is smaller than the sum of its proper divisors (31197579086).

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

20420233524 is a wasteful number, since it uses less digits than its factorization.

20420233524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567228719 (or 567228714 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

Adding to 20420233524 its reverse (42533202402), we get a palindrome (62953435926).

The spelling of 20420233524 in words is "twenty billion, four hundred twenty million, two hundred thirty-three thousand, five hundred twenty-four".