20534553000 has 320 divisors, whose sum is σ = 77305147920. Its totient is φ = 5054400000.

The previous prime is 20534552959. The next prime is 20534553007. The reversal of 20534553000 is 35543502.

20534553000 is a `hidden beast` number, since 205 + 3 + 455 + 3 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 236196 + 20534316804 = 486^2 + 143298^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20534553007) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1043250 + ... + 1062750.

Almost surely, 2^20534553000 is an apocalyptic number.

20534553000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20534553000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38652573960).

20534553000 is an abundant number, since it is smaller than the sum of its proper divisors (56770594920).

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

20534553000 is a wasteful number, since it uses less digits than its factorization.

20534553000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19547 (or 19524 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The spelling of 20534553000 in words is "twenty billion, five hundred thirty-four million, five hundred fifty-three thousand".