20002543240 has 32 divisors (see below), whose sum is σ = 45027829080. Its totient is φ = 7997087232.

The previous prime is 20002543229. The next prime is 20002543273. The reversal of 20002543240 is 4234520002.

It can be written as a sum of positive squares in 4 ways, for example, as 13995363204 + 6007180036 = 118302^2 + 77506^2 .

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, 39669 + ... + 203908.

Almost surely, 2^20002543240 is an apocalyptic number.

20002543240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002543240 is an abundant number, since it is smaller than the sum of its proper divisors (25025285840).

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

20002543240 is a wasteful number, since it uses less digits than its factorization.

20002543240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245641 (or 245637 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The spelling of 20002543240 in words is "twenty billion, two million, five hundred forty-three thousand, two hundred forty".