20606556 has 24 divisors (see below), whose sum is σ = 48157200. Its totient is φ = 6858112.

The previous prime is 20606527. The next prime is 20606557. The reversal of 20606556 is 65560602.

It is a super-2 number, since 2×20606556² = 849260300362272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11770 + ... + 13406.

It is an arithmetic number, because the mean of its divisors is an integer number (2006550).

Almost surely, 2^20606556 is an apocalyptic number.

It is an amenable number.

20606556 is an abundant number, since it is smaller than the sum of its proper divisors (27550644).

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

20606556 is a wasteful number, since it uses less digits than its factorization.

20606556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693 (or 2691 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20606556 is about 4539.4444594025. Note that the first 4 decimals coincide. The cubic root of 20606556 is about 274.1585563555.

The spelling of 20606556 in words is "twenty million, six hundred six thousand, five hundred fifty-six".