20573670 has 64 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 4986240.

The previous prime is 20573669. The next prime is 20573671. The reversal of 20573670 is 7637502.

It is an interprime number because it is at equal distance from previous prime (20573669) and next prime (20573671).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20573671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27319 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^20573670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20573670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998272).

20573670 is an abundant number, since it is smaller than the sum of its proper divisors (33422874).

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

20573670 is a wasteful number, since it uses less digits than its factorization.

20573670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 20573670 is about 4535.8207636546. The cubic root of 20573670 is about 274.0126355016.

The spelling of 20573670 in words is "twenty million, five hundred seventy-three thousand, six hundred seventy".