20751404 has 24 divisors (see below), whose sum is σ = 37208640. Its totient is φ = 10123776.

The previous prime is 20751403. The next prime is 20751457. The reversal of 20751404 is 40415702.

It is a self number, because there is not a number n which added to its sum of digits gives 20751404.

It is not an unprimeable number, because it can be changed into a prime (20751403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30314 + ... + 30990.

It is an arithmetic number, because the mean of its divisors is an integer number (1550360).

Almost surely, 2^20751404 is an apocalyptic number.

It is an amenable number.

20751404 is a deficient number, since it is larger than the sum of its proper divisors (16457236).

20751404 is a wasteful number, since it uses less digits than its factorization.

20751404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20751404 is about 4555.3708959864. The cubic root of 20751404 is about 274.7994306111.

The spelling of 20751404 in words is "twenty million, seven hundred fifty-one thousand, four hundred four".