20908534 has 8 divisors (see below), whose sum is σ = 31382208. Its totient is φ = 10447800.

The previous prime is 20908513. The next prime is 20908603. The reversal of 20908534 is 43580902.

20908534 = T₃₇₃₂ + T₃₇₃₃ + T₃₇₃₄.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20908496 and 20908505.

It is a congruent number.

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, 4684 + ... + 7984.

It is an arithmetic number, because the mean of its divisors is an integer number (3922776).

Almost surely, 2^20908534 is an apocalyptic number.

20908534 is the 3734-th centered triangular number.

20908534 is a deficient number, since it is larger than the sum of its proper divisors (10473674).

20908534 is a wasteful number, since it uses less digits than its factorization.

20908534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6470.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20908534 is about 4572.5850456826. The cubic root of 20908534 is about 275.4912826910.

The spelling of 20908534 in words is "twenty million, nine hundred eight thousand, five hundred thirty-four".