20930070 has 32 divisors (see below), whose sum is σ = 57408768. Its totient is φ = 4783968.

The previous prime is 20930057. The next prime is 20930093. The reversal of 20930070 is 7003902.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

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, 49624 + ... + 50043.

It is an arithmetic number, because the mean of its divisors is an integer number (1794024).

Almost surely, 2^20930070 is an apocalyptic number.

20930070 is an abundant number, since it is smaller than the sum of its proper divisors (36478698).

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

20930070 is a wasteful number, since it uses less digits than its factorization.

20930070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99684.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 20930070 is about 4574.9393438602. The cubic root of 20930070 is about 275.5858364972.

Adding to 20930070 its reverse (7003902), we get a palindrome (27933972).

The spelling of 20930070 in words is "twenty million, nine hundred thirty thousand, seventy".