20193937645 has 16 divisors (see below), whose sum is σ = 29323634688. Its totient is φ = 13032725760.

The previous prime is 20193937627. The next prime is 20193937649. The reversal of 20193937645 is 54673939102.

It is not a de Polignac number, because 20193937645 - 2¹⁵ = 20193904877 is a prime.

It is a super-3 number, since 3×20193937645³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20193937649) 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, 16969101 + ... + 16970290.

It is an arithmetic number, because the mean of its divisors is an integer number (1832727168).

Almost surely, 2^20193937645 is an apocalyptic number.

It is an amenable number.

20193937645 is a deficient number, since it is larger than the sum of its proper divisors (9129697043).

20193937645 is a wasteful number, since it uses less digits than its factorization.

20193937645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33939420.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 20193937645 in words is "twenty billion, one hundred ninety-three million, nine hundred thirty-seven thousand, six hundred forty-five".