20642536 has 16 divisors (see below), whose sum is σ = 38939040. Its totient is φ = 10258800.

The previous prime is 20642527. The next prime is 20642561. The reversal of 20642536 is 63524602.

It is a happy number.

It is a super-2 number, since 2×20642536² = 852228585022592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390 + ... + 9061.

It is an arithmetic number, because the mean of its divisors is an integer number (2433690).

Almost surely, 2^20642536 is an apocalyptic number.

It is an amenable number.

20642536 is a deficient number, since it is larger than the sum of its proper divisors (18296504).

20642536 is a wasteful number, since it uses less digits than its factorization.

20642536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15624 (or 15620 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20642536 is about 4543.4057710048. The cubic root of 20642536 is about 274.3180280836.

The spelling of 20642536 in words is "twenty million, six hundred forty-two thousand, five hundred thirty-six".