20421610 has 16 divisors (see below), whose sum is σ = 40100832. Its totient is φ = 7426000.

The previous prime is 20421593. The next prime is 20421629. The reversal of 20421610 is 1612402.

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, 92716 + ... + 92935.

It is an arithmetic number, because the mean of its divisors is an integer number (2506302).

Almost surely, 2^20421610 is an apocalyptic number.

20421610 is a deficient number, since it is larger than the sum of its proper divisors (19679222).

20421610 is a wasteful number, since it uses less digits than its factorization.

20421610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185669.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20421610 is about 4519.0275502590. The cubic root of 20421610 is about 273.3358896582.

The spelling of 20421610 in words is "twenty million, four hundred twenty-one thousand, six hundred ten".