20818534 has 12 divisors (see below), whose sum is σ = 34325172. Its totient is φ = 9462860.

The previous prime is 20818517. The next prime is 20818537. The reversal of 20818534 is 43581802.

It is a super-2 number, since 2×20818534² = 866822715818312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20818496 and 20818505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42772 + ... + 43255.

It is an arithmetic number, because the mean of its divisors is an integer number (2860431).

Almost surely, 2^20818534 is an apocalyptic number.

20818534 is a deficient number, since it is larger than the sum of its proper divisors (13506638).

20818534 is a wasteful number, since it uses less digits than its factorization.

20818534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86051 (or 86040 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20818534 is about 4562.7331721239. The cubic root of 20818534 is about 275.0954335444.

The spelling of 20818534 in words is "twenty million, eight hundred eighteen thousand, five hundred thirty-four".