20506543662 has 16 divisors (see below), whose sum is σ = 44741549952. Its totient is φ = 6214104120.

The previous prime is 20506543621. The next prime is 20506543703. The reversal of 20506543662 is 26634560502.

It is an interprime number because it is at equal distance from previous prime (20506543621) and next prime (20506543703).

It is a self number, because there is not a number n which added to its sum of digits gives 20506543662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155352538 + ... + 155352669.

It is an arithmetic number, because the mean of its divisors is an integer number (2796346872).

Almost surely, 2^20506543662 is an apocalyptic number.

20506543662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20506543662 is an abundant number, since it is smaller than the sum of its proper divisors (24235006290).

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

20506543662 is a wasteful number, since it uses less digits than its factorization.

20506543662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310705223.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 20506543662 in words is "twenty billion, five hundred six million, five hundred forty-three thousand, six hundred sixty-two".