20574021 has 16 divisors (see below), whose sum is σ = 30562560. Its totient is φ = 12223680.

The previous prime is 20574011. The next prime is 20574031. The reversal of 20574021 is 12047502.

It is an interprime number because it is at equal distance from previous prime (20574011) and next prime (20574031).

It is not a de Polignac number, because 20574021 - 2⁵ = 20573989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20574011) 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, 7965 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (1910160).

Almost surely, 2^20574021 is an apocalyptic number.

It is an amenable number.

20574021 is a deficient number, since it is larger than the sum of its proper divisors (9988539).

20574021 is a wasteful number, since it uses less digits than its factorization.

20574021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18236.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20574021 is about 4535.8594554946. The cubic root of 20574021 is about 274.0141937698.

It can be divided in two parts, 205740 and 21, that added together give a triangular number (205761 = T₆₄₁).

The spelling of 20574021 in words is "twenty million, five hundred seventy-four thousand, twenty-one".