20101919202 has 20 divisors (see below), whose sum is σ = 45043189686. Its totient is φ = 6700639680.

The previous prime is 20101919191. The next prime is 20101919207. The reversal of 20101919202 is 20291910102.

It can be written as a sum of positive squares in only one way, i.e., 20095614081 + 6305121 = 141759^2 + 2511^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20101919207) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62042799 + ... + 62043122.

Almost surely, 2^20101919202 is an apocalyptic number.

20101919202 is an abundant number, since it is smaller than the sum of its proper divisors (24941270484).

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

20101919202 is a wasteful number, since it uses less digits than its factorization.

20101919202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124085935 (or 124085926 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 20101919202 in words is "twenty billion, one hundred one million, nine hundred nineteen thousand, two hundred two".