20700730 has 32 divisors (see below), whose sum is σ = 39688704. Its totient is φ = 7746816.

The previous prime is 20700697. The next prime is 20700733. The reversal of 20700730 is 3700702.

20700730 = T₃₆ + T₃₇ + ... + T₄₉₈.

It is a junction number, because it is equal to n+sod(n) for n = 20700698 and 20700707.

It is not an unprimeable number, because it can be changed into a prime (20700733) 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, 44479 + ... + 44941.

It is an arithmetic number, because the mean of its divisors is an integer number (1240272).

Almost surely, 2^20700730 is an apocalyptic number.

20700730 is a deficient number, since it is larger than the sum of its proper divisors (18987974).

20700730 is a wasteful number, since it uses less digits than its factorization.

20700730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 294, while the sum is 19.

The square root of 20700730 is about 4549.8054903479. The cubic root of 20700730 is about 274.5755656517.

The spelling of 20700730 in words is "twenty million, seven hundred thousand, seven hundred thirty".