20787078 has 32 divisors (see below), whose sum is σ = 46722816. Its totient is φ = 6117408.

The previous prime is 20787061. The next prime is 20787079. The reversal of 20787078 is 87078702.

It is a super-2 number, since 2×20787078² = 864205223556168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787079) 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, 4000 + ... + 7587.

It is an arithmetic number, because the mean of its divisors is an integer number (1460088).

Almost surely, 2^20787078 is an apocalyptic number.

20787078 is an abundant number, since it is smaller than the sum of its proper divisors (25935738).

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

20787078 is a wasteful number, since it uses less digits than its factorization.

20787078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11628.

The product of its (nonzero) digits is 43904, while the sum is 39.

The square root of 20787078 is about 4559.2848123363. The cubic root of 20787078 is about 274.9568108483.

The spelling of 20787078 in words is "twenty million, seven hundred eighty-seven thousand, seventy-eight".