20749878 has 16 divisors (see below), whose sum is σ = 46110960. Its totient is φ = 6916608.

The previous prime is 20749837. The next prime is 20749879. The reversal of 20749878 is 87894702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749879) 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, 192075 + ... + 192182.

It is an arithmetic number, because the mean of its divisors is an integer number (2881935).

Almost surely, 2^20749878 is an apocalyptic number.

20749878 is an abundant number, since it is smaller than the sum of its proper divisors (25361082).

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

20749878 is a wasteful number, since it uses less digits than its factorization.

20749878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384268 (or 384262 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 20749878 is about 4555.2033983127. The cubic root of 20749878 is about 274.7926944531.

The spelling of 20749878 in words is "twenty million, seven hundred forty-nine thousand, eight hundred seventy-eight".