20401730118 has 64 divisors (see below), whose sum is σ = 56524285440. Its totient is φ = 5299149600.

The previous prime is 20401730053. The next prime is 20401730119. The reversal of 20401730118 is 81103710402.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20401730091 and 20401730100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401730119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2449153 + ... + 2457468.

It is an arithmetic number, because the mean of its divisors is an integer number (883191960).

Almost surely, 2^20401730118 is an apocalyptic number.

20401730118 is an abundant number, since it is smaller than the sum of its proper divisors (36122555322).

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

20401730118 is a wasteful number, since it uses less digits than its factorization.

20401730118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906650 (or 4906644 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The spelling of 20401730118 in words is "twenty billion, four hundred one million, seven hundred thirty thousand, one hundred eighteen".