20421092 has 24 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 9948960.

The previous prime is 20421073. The next prime is 20421103. The reversal of 20421092 is 29012402.

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, 30659 + ... + 31317.

It is an arithmetic number, because the mean of its divisors is an integer number (1527680).

Almost surely, 2^20421092 is an apocalyptic number.

It is an amenable number.

20421092 is a deficient number, since it is larger than the sum of its proper divisors (16243228).

20421092 is a wasteful number, since it uses less digits than its factorization.

20421092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20421092 is about 4518.9702366800. The cubic root of 20421092 is about 273.3335785575. Note that the first 3 decimals are identical.

Adding to 20421092 its reverse (29012402), we get a palindrome (49433494).

The spelling of 20421092 in words is "twenty million, four hundred twenty-one thousand, ninety-two".