20890734 has 32 divisors (see below), whose sum is σ = 42804096. Its totient is φ = 6795360.

The previous prime is 20890721. The next prime is 20890757. The reversal of 20890734 is 43709802.

It is a junction number, because it is equal to n+sod(n) for n = 20890695 and 20890704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62949 + ... + 63279.

It is an arithmetic number, because the mean of its divisors is an integer number (1337628).

Almost surely, 2^20890734 is an apocalyptic number.

20890734 is an abundant number, since it is smaller than the sum of its proper divisors (21913362).

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

20890734 is a wasteful number, since it uses less digits than its factorization.

20890734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20890734 is about 4570.6382486476. The cubic root of 20890734 is about 275.4130827710.

The spelling of 20890734 in words is "twenty million, eight hundred ninety thousand, seven hundred thirty-four".