20839991942 has 32 divisors (see below), whose sum is σ = 39768883200. Its totient is φ = 8119474440.

The previous prime is 20839991933. The next prime is 20839991951. The reversal of 20839991942 is 24919993802.

It is an interprime number because it is at equal distance from previous prime (20839991933) and next prime (20839991951).

It is a congruent number.

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, 1373318 + ... + 1388409.

It is an arithmetic number, because the mean of its divisors is an integer number (1242777600).

Almost surely, 2^20839991942 is an apocalyptic number.

20839991942 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20839991942 is a deficient number, since it is larger than the sum of its proper divisors (18928891258).

20839991942 is a wasteful number, since it uses less digits than its factorization.

20839991942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761761 (or 2761747 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 20839991942 in words is "twenty billion, eight hundred thirty-nine million, nine hundred ninety-one thousand, nine hundred forty-two".