20520822 has 32 divisors (see below), whose sum is σ = 48420864. Its totient is φ = 5673600.

The previous prime is 20520821. The next prime is 20520823. The reversal of 20520822 is 22802502.

It is an interprime number because it is at equal distance from previous prime (20520821) and next prime (20520823).

It is a super-2 number, since 2×20520822² = 842208271111368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520821) 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, 6579 + ... + 9182.

It is an arithmetic number, because the mean of its divisors is an integer number (1513152).

Almost surely, 2^20520822 is an apocalyptic number.

20520822 is an abundant number, since it is smaller than the sum of its proper divisors (27900042).

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

20520822 is a wasteful number, since it uses less digits than its factorization.

20520822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15804.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 20520822 is about 4529.9913907203. The cubic root of 20520822 is about 273.7778137332. Note that the first 3 decimals are identical.

The spelling of 20520822 in words is "twenty million, five hundred twenty thousand, eight hundred twenty-two".