20002355551 has 4 divisors (see below), whose sum is σ = 20427937632. Its totient is φ = 19576773472.

The previous prime is 20002355501. The next prime is 20002355557. The reversal of 20002355551 is 15555320002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20002355551 - 2¹⁵ = 20002322783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002355557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212790970 + ... + 212791063.

It is an arithmetic number, because the mean of its divisors is an integer number (5106984408).

Almost surely, 2^20002355551 is an apocalyptic number.

20002355551 is a deficient number, since it is larger than the sum of its proper divisors (425582081).

20002355551 is an equidigital number, since it uses as much as digits as its factorization.

20002355551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425582080.

The product of its (nonzero) digits is 7500, while the sum is 28.

Adding to 20002355551 its reverse (15555320002), we get a palindrome (35557675553).

The spelling of 20002355551 in words is "twenty billion, two million, three hundred fifty-five thousand, five hundred fifty-one".