20531994 has 32 divisors (see below), whose sum is σ = 47080320. Its totient is φ = 5847552.

The previous prime is 20531983. The next prime is 20531999. The reversal of 20531994 is 49913502.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20531999) 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, 17622 + ... + 18750.

It is an arithmetic number, because the mean of its divisors is an integer number (1471260).

Almost surely, 2^20531994 is an apocalyptic number.

20531994 is an abundant number, since it is smaller than the sum of its proper divisors (26548326).

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

20531994 is a wasteful number, since it uses less digits than its factorization.

20531994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20531994 is about 4531.2243378584. The cubic root of 20531994 is about 273.8274883327.

The spelling of 20531994 in words is "twenty million, five hundred thirty-one thousand, nine hundred ninety-four".