20622978 has 32 divisors (see below), whose sum is σ = 46612800. Its totient is φ = 6756768.

The previous prime is 20622977. The next prime is 20622983. The reversal of 20622978 is 87922602.

20622978 is a `hidden beast` number, since 20 + 622 + 9 + 7 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20622977) 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, 51 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (1456650).

Almost surely, 2^20622978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20622978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23306400).

20622978 is an abundant number, since it is smaller than the sum of its proper divisors (25989822).

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

20622978 is a wasteful number, since it uses less digits than its factorization.

20622978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6543 (or 6537 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20622978 is about 4541.2529108166. The cubic root of 20622978 is about 274.2313654873.

The spelling of 20622978 in words is "twenty million, six hundred twenty-two thousand, nine hundred seventy-eight".