20493970 has 48 divisors (see below), whose sum is σ = 44549568. Its totient is φ = 6648480.

The previous prime is 20493961. The next prime is 20493971. The reversal of 20493970 is 7939402.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20493971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24865 + ... + 25675.

It is an arithmetic number, because the mean of its divisors is an integer number (928116).

Almost surely, 2^20493970 is an apocalyptic number.

20493970 is an abundant number, since it is smaller than the sum of its proper divisors (24055598).

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

20493970 is a wasteful number, since it uses less digits than its factorization.

20493970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20493970 is about 4527.0266179911. The cubic root of 20493970 is about 273.6583466099.

The spelling of 20493970 in words is "twenty million, four hundred ninety-three thousand, nine hundred seventy".