20537970 has 16 divisors (see below), whose sum is σ = 49291200. Its totient is φ = 5476784.

The previous prime is 20537969. The next prime is 20537981. The reversal of 20537970 is 7973502.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342270 + ... + 342329.

It is an arithmetic number, because the mean of its divisors is an integer number (3080700).

Almost surely, 2^20537970 is an apocalyptic number.

20537970 is an abundant number, since it is smaller than the sum of its proper divisors (28753230).

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

20537970 is a wasteful number, since it uses less digits than its factorization.

20537970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684609.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20537970 is about 4531.8837143069. The cubic root of 20537970 is about 273.8540523110.

The spelling of 20537970 in words is "twenty million, five hundred thirty-seven thousand, nine hundred seventy".