20836534 has 4 divisors (see below), whose sum is σ = 31254804. Its totient is φ = 10418266.

The previous prime is 20836507. The next prime is 20836537. The reversal of 20836534 is 43563802.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20836534² = 868322298266312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20836496 and 20836505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5209132 + ... + 5209135.

It is an arithmetic number, because the mean of its divisors is an integer number (7813701).

Almost surely, 2^20836534 is an apocalyptic number.

20836534 is a deficient number, since it is larger than the sum of its proper divisors (10418270).

20836534 is a wasteful number, since it uses less digits than its factorization.

20836534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10418269.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20836534 is about 4564.7052478775. The cubic root of 20836534 is about 275.1746945110.

The spelling of 20836534 in words is "twenty million, eight hundred thirty-six thousand, five hundred thirty-four".