20742579 has 48 divisors (see below), whose sum is σ = 35852544. Its totient is φ = 11390400.

The previous prime is 20742563. The next prime is 20742581. The reversal of 20742579 is 97524702.

It is not a de Polignac number, because 20742579 - 2⁴ = 20742563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20742539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91264 + ... + 91490.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^20742579 is an apocalyptic number.

20742579 is a deficient number, since it is larger than the sum of its proper divisors (15109965).

20742579 is a wasteful number, since it uses less digits than its factorization.

20742579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20742579 is about 4554.4021561562. The cubic root of 20742579 is about 274.7604702138.

It can be divided in two parts, 20742 and 579, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20742579 in words is "twenty million, seven hundred forty-two thousand, five hundred seventy-nine".