20511502000 has 80 divisors (see below), whose sum is σ = 54105670944. Its totient is φ = 7458720000.

The previous prime is 20511501979. The next prime is 20511502013. The reversal of 20511502000 is 20511502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444171 + ... + 488170.

Almost surely, 2^20511502000 is an apocalyptic number.

20511502000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511502000 is an abundant number, since it is smaller than the sum of its proper divisors (33594168944).

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

20511502000 is a wasteful number, since it uses less digits than its factorization.

20511502000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932375 (or 932359 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

20511502000 divided by its reverse (20511502) gives a cube (1000 = 10³).

It can be divided in two parts, 2051 and 1502000, that added together give a palindrome (1504051).

The spelling of 20511502000 in words is "twenty billion, five hundred eleven million, five hundred two thousand".