20520860 has 12 divisors (see below), whose sum is σ = 43093848. Its totient is φ = 8208336.

The previous prime is 20520859. The next prime is 20520881. The reversal of 20520860 is 6802502.

It is a happy number.

It is a super-2 number, since 2×20520860² = 842211390279200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513002 + ... + 513041.

It is an arithmetic number, because the mean of its divisors is an integer number (3591154).

Almost surely, 2^20520860 is an apocalyptic number.

20520860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520860 is an abundant number, since it is smaller than the sum of its proper divisors (22572988).

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

20520860 is a wasteful number, since it uses less digits than its factorization.

20520860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026052 (or 1026050 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20520860 is about 4529.9955849868. The cubic root of 20520860 is about 273.7779827250. Note that the first 3 decimals are identical.

The spelling of 20520860 in words is "twenty million, five hundred twenty thousand, eight hundred sixty".