20930624 has 56 divisors (see below), whose sum is σ = 48816768. Its totient is φ = 8778240.

The previous prime is 20930617. The next prime is 20930627. The reversal of 20930624 is 42603902.

It is a Cunningham number, because it is equal to 4575²-1.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 20930593 and 20930602.

It is not an unprimeable number, because it can be changed into a prime (20930627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8009 + ... + 10295.

It is an arithmetic number, because the mean of its divisors is an integer number (871728).

Almost surely, 2^20930624 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 20930624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24408384).

20930624 is an abundant number, since it is smaller than the sum of its proper divisors (27886144).

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

20930624 is a wasteful number, since it uses less digits than its factorization.

20930624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20930624 is about 4574.9998907104. Note that the first 3 decimals coincide. The cubic root of 20930624 is about 275.5882679783.

The spelling of 20930624 in words is "twenty million, nine hundred thirty thousand, six hundred twenty-four".