20534994 has 36 divisors (see below), whose sum is σ = 45625086. Its totient is φ = 6674976.

The previous prime is 20534981. The next prime is 20534999. The reversal of 20534994 is 49943502.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 149769 = 4515^2 + 387^2 .

It is a super-3 number, since 3×20534994³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20534999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 32974 + ... + 33590.

Almost surely, 2^20534994 is an apocalyptic number.

20534994 is an abundant number, since it is smaller than the sum of its proper divisors (25090092).

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

20534994 is a wasteful number, since it uses less digits than its factorization.

20534994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20534994 is about 4531.5553621246. Note that the first 3 decimals coincide. The cubic root of 20534994 is about 273.8408243074.

It can be divided in two parts, 20534 and 994, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 20534994 in words is "twenty million, five hundred thirty-four thousand, nine hundred ninety-four".