20621952 has 224 divisors, whose sum is σ = 70236180. Its totient is φ = 5971968.

The previous prime is 20621947. The next prime is 20621959. The reversal of 20621952 is 25912602.

It can be written as a sum of positive squares in 2 ways, for example, as 20575296 + 46656 = 4536^2 + 216^2 .

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 (20621959) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1213048 + ... + 1213064.

Almost surely, 2^20621952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35118090).

20621952 is an abundant number, since it is smaller than the sum of its proper divisors (49614228).

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

20621952 is an equidigital number, since it uses as much as digits as its factorization.

20621952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20621952 is about 4541.1399449918. The cubic root of 20621952 is about 274.2268177114.

The spelling of 20621952 in words is "twenty million, six hundred twenty-one thousand, nine hundred fifty-two".