20642620 has 12 divisors (see below), whose sum is σ = 43349544. Its totient is φ = 8257040.

The previous prime is 20642603. The next prime is 20642627. The reversal of 20642620 is 2624602.

It is a happy number.

It is a super-2 number, since 2×20642620² = 852235520928800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642591 and 20642600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516046 + ... + 516085.

It is an arithmetic number, because the mean of its divisors is an integer number (3612462).

Almost surely, 2^20642620 is an apocalyptic number.

20642620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20642620 is an abundant number, since it is smaller than the sum of its proper divisors (22706924).

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

20642620 is a wasteful number, since it uses less digits than its factorization.

20642620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032140 (or 1032138 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20642620 is about 4543.4150151621. The cubic root of 20642620 is about 274.3184001743.

The spelling of 20642620 in words is "twenty million, six hundred forty-two thousand, six hundred twenty".