20020532251 has 8 divisors (see below), whose sum is σ = 20670408704. Its totient is φ = 19370909160.

The previous prime is 20020532243. The next prime is 20020532293. The reversal of 20020532251 is 15223502002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20020532251 - 2³ = 20020532243 is a prime.

It is a super-2 number, since 2×20020532251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020533251) 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, 104350 + ... + 225676.

It is an arithmetic number, because the mean of its divisors is an integer number (2583801088).

Almost surely, 2^20020532251 is an apocalyptic number.

20020532251 is a deficient number, since it is larger than the sum of its proper divisors (649876453).

20020532251 is a wasteful number, since it uses less digits than its factorization.

20020532251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126681.

The product of its (nonzero) digits is 1200, while the sum is 22.

The spelling of 20020532251 in words is "twenty billion, twenty million, five hundred thirty-two thousand, two hundred fifty-one".