20508893 has 16 divisors (see below), whose sum is σ = 22239360. Its totient is φ = 18864384.

The previous prime is 20508889. The next prime is 20508899. The reversal of 20508893 is 39880502.

It is a cyclic number.

It is not a de Polignac number, because 20508893 - 2² = 20508889 is a prime.

It is a super-2 number, since 2×20508893² = 841229384170898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87905 + ... + 88137.

It is an arithmetic number, because the mean of its divisors is an integer number (1389960).

Almost surely, 2^20508893 is an apocalyptic number.

20508893 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20508893 is a deficient number, since it is larger than the sum of its proper divisors (1730467).

20508893 is a wasteful number, since it uses less digits than its factorization.

20508893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20508893 is about 4528.6745301468. The cubic root of 20508893 is about 273.7247533412.

The spelling of 20508893 in words is "twenty million, five hundred eight thousand, eight hundred ninety-three".