20621946 has 16 divisors (see below), whose sum is σ = 41484384. Its totient is φ = 6833904.

The previous prime is 20621921. The next prime is 20621947. The reversal of 20621946 is 64912602.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20621947) 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, 8896 + ... + 10971.

It is an arithmetic number, because the mean of its divisors is an integer number (2592774).

Almost surely, 2^20621946 is an apocalyptic number.

20621946 is an abundant number, since it is smaller than the sum of its proper divisors (20862438).

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

20621946 is a wasteful number, since it uses less digits than its factorization.

20621946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20045.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20621946 is about 4541.1392843647. The cubic root of 20621946 is about 274.2267911157.

The spelling of 20621946 in words is "twenty million, six hundred twenty-one thousand, nine hundred forty-six".