20491039020 has 48 divisors (see below), whose sum is σ = 59869474560. Its totient is φ = 5226699456.

The previous prime is 20491038989. The next prime is 20491039027. The reversal of 20491039020 is 2093019402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20491039027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7422910 + ... + 7425669.

It is an arithmetic number, because the mean of its divisors is an integer number (1247280720).

Almost surely, 2^20491039020 is an apocalyptic number.

20491039020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20491039020 is an abundant number, since it is smaller than the sum of its proper divisors (39378435540).

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

20491039020 is a wasteful number, since it uses less digits than its factorization.

20491039020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14848614 (or 14848612 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The spelling of 20491039020 in words is "twenty billion, four hundred ninety-one million, thirty-nine thousand, twenty".