20554243512 has 32 divisors (see below), whose sum is σ = 56057028480. Its totient is φ = 6228558560.

The previous prime is 20554243511. The next prime is 20554243517. The reversal of 20554243512 is 21534245502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554243511) 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, 38928228 + ... + 38928755.

It is an arithmetic number, because the mean of its divisors is an integer number (1751782140).

Almost surely, 2^20554243512 is an apocalyptic number.

20554243512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20554243512 is an abundant number, since it is smaller than the sum of its proper divisors (35502784968).

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

20554243512 is a wasteful number, since it uses less digits than its factorization.

20554243512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77857003 (or 77856999 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 20554243512 in words is "twenty billion, five hundred fifty-four million, two hundred forty-three thousand, five hundred twelve".