20642860 has 24 divisors (see below), whose sum is σ = 49543200. Its totient is φ = 7077504.

The previous prime is 20642857. The next prime is 20642899. The reversal of 20642860 is 6824602.

It is a super-2 number, since 2×20642860² = 852255337959200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73585 + ... + 73864.

It is an arithmetic number, because the mean of its divisors is an integer number (2064300).

Almost surely, 2^20642860 is an apocalyptic number.

20642860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20642860 is an abundant number, since it is smaller than the sum of its proper divisors (28900340).

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

20642860 is a wasteful number, since it uses less digits than its factorization.

20642860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147465 (or 147463 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20642860 is about 4543.4414269362. The cubic root of 20642860 is about 274.3194632848.

The spelling of 20642860 in words is "twenty million, six hundred forty-two thousand, eight hundred sixty".