20572380 has 168 divisors, whose sum is σ = 69409872. Its totient is φ = 5101056.

The previous prime is 20572379. The next prime is 20572381. The reversal of 20572380 is 8327502.

It is an interprime number because it is at equal distance from previous prime (20572379) and next prime (20572381).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572381) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 247819 + ... + 247901.

It is an arithmetic number, because the mean of its divisors is an integer number (413154).

Almost surely, 2^20572380 is an apocalyptic number.

20572380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20572380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34704936).

20572380 is an abundant number, since it is smaller than the sum of its proper divisors (48837492).

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

20572380 is a wasteful number, since it uses less digits than its factorization.

20572380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20572380 is about 4535.6785600393. The cubic root of 20572380 is about 274.0069083807.

Adding to 20572380 its reverse (8327502), we get a palindrome (28899882).

The spelling of 20572380 in words is "twenty million, five hundred seventy-two thousand, three hundred eighty".