20794473749 has 8 divisors (see below), whose sum is σ = 23778426048. Its totient is φ = 17813849760.

The previous prime is 20794473737. The next prime is 20794473761. The reversal of 20794473749 is 94737449702.

It is an interprime number because it is at equal distance from previous prime (20794473737) and next prime (20794473761).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20794473749 - 2¹² = 20794469653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20794473694 and 20794473703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20794473149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818672 + ... + 843689.

It is an arithmetic number, because the mean of its divisors is an integer number (2972303256).

Almost surely, 2^20794473749 is an apocalyptic number.

It is an amenable number.

20794473749 is a deficient number, since it is larger than the sum of its proper divisors (2983952299).

20794473749 is a wasteful number, since it uses less digits than its factorization.

20794473749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664155.

The product of its (nonzero) digits is 10668672, while the sum is 56.

The spelling of 20794473749 in words is "twenty billion, seven hundred ninety-four million, four hundred seventy-three thousand, seven hundred forty-nine".