20750406 has 16 divisors (see below), whose sum is σ = 42384384. Its totient is φ = 6769544.

The previous prime is 20750371. The next prime is 20750407. The reversal of 20750406 is 60405702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750407) 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, 36510 + ... + 37073.

It is an arithmetic number, because the mean of its divisors is an integer number (2649024).

Almost surely, 2^20750406 is an apocalyptic number.

20750406 is an abundant number, since it is smaller than the sum of its proper divisors (21633978).

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

20750406 is a wasteful number, since it uses less digits than its factorization.

20750406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73635.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20750406 is about 4555.2613536437. The cubic root of 20750406 is about 274.7950252188.

The spelling of 20750406 in words is "twenty million, seven hundred fifty thousand, four hundred six".