19947497430 has 64 divisors (see below), whose sum is σ = 54729059328. Its totient is φ = 4558101120.

The previous prime is 19947497413. The next prime is 19947497447. The reversal of 19947497430 is 3479474991.

19947497430 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (19947497413) and next prime (19947497447).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 832599 + ... + 856221.

It is an arithmetic number, because the mean of its divisors is an integer number (855141552).

Almost surely, 2^19947497430 is an apocalyptic number.

19947497430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19947497430 is an abundant number, since it is smaller than the sum of its proper divisors (34781561898).

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

19947497430 is a wasteful number, since it uses less digits than its factorization.

19947497430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27661.

The product of its (nonzero) digits is 6858432, while the sum is 57.

The spelling of 19947497430 in words is "nineteen billion, nine hundred forty-seven million, four hundred ninety-seven thousand, four hundred thirty".