20693890 has 32 divisors (see below), whose sum is σ = 43006464. Its totient is φ = 7022400.

The previous prime is 20693887. The next prime is 20693891. The reversal of 20693890 is 9839602.

It is not an unprimeable number, because it can be changed into a prime (20693891) 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, 5607 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (1343952).

Almost surely, 2^20693890 is an apocalyptic number.

20693890 is an abundant number, since it is smaller than the sum of its proper divisors (22312574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20693890 is a wasteful number, since it uses less digits than its factorization.

20693890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20693890 is about 4549.0537477590. The cubic root of 20693890 is about 274.5453202809.

The spelling of 20693890 in words is "twenty million, six hundred ninety-three thousand, eight hundred ninety".