20606406 has 16 divisors (see below), whose sum is σ = 41310000. Its totient is φ = 6852608.

The previous prime is 20606371. The next prime is 20606419. The reversal of 20606406 is 60460602.

20606406 = 739² + 740² + ... + 774².

It is a Curzon number.

It is a congruent number.

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, 1131 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (2581875).

Almost surely, 2^20606406 is an apocalyptic number.

20606406 is an abundant number, since it is smaller than the sum of its proper divisors (20703594).

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

20606406 is a wasteful number, since it uses less digits than its factorization.

20606406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20606406 is about 4539.4279375269. The cubic root of 20606406 is about 274.1578911322.

It can be divided in two parts, 20606 and 406, that added together give a palindrome (21012).

The spelling of 20606406 in words is "twenty million, six hundred six thousand, four hundred six".