20738109645 has 96 divisors (see below), whose sum is σ = 42807098880. Its totient is φ = 9525522240.

The previous prime is 20738109559. The next prime is 20738109653. The reversal of 20738109645 is 54690183702.

20738109645 is a `hidden beast` number, since 207 + 381 + 0 + 9 + 64 + 5 = 666.

It is not a de Polignac number, because 20738109645 - 2⁸ = 20738109389 is a prime.

It is a super-3 number, since 3×20738109645³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20738109645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 213102 + ... + 294768.

It is an arithmetic number, because the mean of its divisors is an integer number (445907280).

It is a 1-persistent number, because it is pandigital, but 2⋅20738109645 = 41476219290 is not.

Almost surely, 2^20738109645 is an apocalyptic number.

It is an amenable number.

20738109645 is an abundant number, since it is smaller than the sum of its proper divisors (22068989235).

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

20738109645 is a wasteful number, since it uses less digits than its factorization.

20738109645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81717 (or 81705 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 20738109645 in words is "twenty billion, seven hundred thirty-eight million, one hundred nine thousand, six hundred forty-five".