20739570 has 32 divisors (see below), whose sum is σ = 50295168. Its totient is φ = 5472768.

The previous prime is 20739559. The next prime is 20739571. The reversal of 20739570 is 7593702.

It is not an unprimeable number, because it can be changed into a prime (20739571) 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, 654 + ... + 6473.

It is an arithmetic number, because the mean of its divisors is an integer number (1571724).

Almost surely, 2^20739570 is an apocalyptic number.

20739570 is an abundant number, since it is smaller than the sum of its proper divisors (29555598).

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

20739570 is a wasteful number, since it uses less digits than its factorization.

20739570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7234.

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

The square root of 20739570 is about 4554.0718044405. The cubic root of 20739570 is about 274.7471836269.

The spelling of 20739570 in words is "twenty million, seven hundred thirty-nine thousand, five hundred seventy".