20259618940 has 48 divisors (see below), whose sum is σ = 46428852960. Its totient is φ = 7364609280.

The previous prime is 20259618937. The next prime is 20259618949. The reversal of 20259618940 is 4981695202.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259618949) 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, 701506 + ... + 729814.

It is an arithmetic number, because the mean of its divisors is an integer number (967267770).

Almost surely, 2^20259618940 is an apocalyptic number.

20259618940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20259618940 is an abundant number, since it is smaller than the sum of its proper divisors (26169234020).

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

20259618940 is a wasteful number, since it uses less digits than its factorization.

20259618940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31582 (or 31580 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 20259618940 in words is "twenty billion, two hundred fifty-nine million, six hundred eighteen thousand, nine hundred forty".