20921046 has 32 divisors (see below), whose sum is σ = 43009920. Its totient is φ = 6781824.

The previous prime is 20921041. The next prime is 20921059. The reversal of 20921046 is 64012902.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20921041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39741 + ... + 40263.

It is an arithmetic number, because the mean of its divisors is an integer number (1344060).

Almost surely, 2^20921046 is an apocalyptic number.

20921046 is an abundant number, since it is smaller than the sum of its proper divisors (22088874).

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

20921046 is a wasteful number, since it uses less digits than its factorization.

20921046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20921046 is about 4573.9529949487. The cubic root of 20921046 is about 275.5462245246.

Adding to 20921046 its reverse (64012902), we get a palindrome (84933948).

The spelling of 20921046 in words is "twenty million, nine hundred twenty-one thousand, forty-six".