20539772 has 24 divisors (see below), whose sum is σ = 40566960. Its totient is φ = 9013760.

The previous prime is 20539769. The next prime is 20539781. The reversal of 20539772 is 27793502.

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, 6773 + ... + 9324.

It is an arithmetic number, because the mean of its divisors is an integer number (1690290).

Almost surely, 2^20539772 is an apocalyptic number.

20539772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20539772 is the 2423-rd centered heptagonal number.

It is an amenable number.

20539772 is a deficient number, since it is larger than the sum of its proper divisors (20027188).

20539772 is a wasteful number, since it uses less digits than its factorization.

20539772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16141 (or 16139 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 20539772 is about 4532.0825235205. The cubic root of 20539772 is about 273.8620613884.

The spelling of 20539772 in words is "twenty million, five hundred thirty-nine thousand, seven hundred seventy-two".