20542940 has 24 divisors (see below), whose sum is σ = 47062512. Its totient is φ = 7470080.

The previous prime is 20542939. The next prime is 20542961. The reversal of 20542940 is 4924502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46469 + ... + 46908.

It is an arithmetic number, because the mean of its divisors is an integer number (1960938).

Almost surely, 2^20542940 is an apocalyptic number.

20542940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542940 is an abundant number, since it is smaller than the sum of its proper divisors (26519572).

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

20542940 is a wasteful number, since it uses less digits than its factorization.

20542940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93397 (or 93395 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20542940 is about 4532.4320182436. The cubic root of 20542940 is about 273.8761405841.

It can be divided in two parts, 2054 and 2940, that added together give a palindrome (4994).

The spelling of 20542940 in words is "twenty million, five hundred forty-two thousand, nine hundred forty".