20660420 has 24 divisors (see below), whose sum is σ = 47331648. Its totient is φ = 7512800.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660420 is 2406602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20660392 and 20660401.

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, 46736 + ... + 47175.

It is an arithmetic number, because the mean of its divisors is an integer number (1972152).

Almost surely, 2^20660420 is an apocalyptic number.

20660420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20660420 is an abundant number, since it is smaller than the sum of its proper divisors (26671228).

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

20660420 is a wasteful number, since it uses less digits than its factorization.

20660420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93931 (or 93929 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20660420 is about 4545.3734720043. The cubic root of 20660420 is about 274.3972251927.

The spelling of 20660420 in words is "twenty million, six hundred sixty thousand, four hundred twenty".