20702930 has 16 divisors (see below), whose sum is σ = 37318104. Its totient is φ = 8269440.

The previous prime is 20702911. The next prime is 20702971. The reversal of 20702930 is 3920702.

It can be written as a sum of positive squares in 4 ways, for example, as 15499969 + 5202961 = 3937^2 + 2281^2 .

It is a super-2 number, since 2×20702930² = 857222621169800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20702896 and 20702905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10934 + ... + 12686.

Almost surely, 2^20702930 is an apocalyptic number.

20702930 is a deficient number, since it is larger than the sum of its proper divisors (16615174).

20702930 is a wasteful number, since it uses less digits than its factorization.

20702930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20702930 is about 4550.0472525019. The cubic root of 20702930 is about 274.5852922789.

The spelling of 20702930 in words is "twenty million, seven hundred two thousand, nine hundred thirty".