20542140100 has 18 divisors (see below), whose sum is σ = 44576444234. Its totient is φ = 8216856000.

The previous prime is 20542140013. The next prime is 20542140133. The reversal of 20542140100 is 104124502.

It can be written as a sum of positive squares in 3 ways, for example, as 418447936 + 20123692164 = 20456^2 + 141858^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102710601 + ... + 102710800.

Almost surely, 2^20542140100 is an apocalyptic number.

20542140100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542140100 is an abundant number, since it is smaller than the sum of its proper divisors (24034304134).

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

20542140100 is a wasteful number, since it uses less digits than its factorization.

20542140100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205421415 (or 205421408 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 20542140100 its reverse (104124502), we get a palindrome (20646264602).

The spelling of 20542140100 in words is "twenty billion, five hundred forty-two million, one hundred forty thousand, one hundred".