20970090 has 40 divisors (see below), whose sum is σ = 56388420. Its totient is φ = 5591808.

The previous prime is 20970077. The next prime is 20970101. The reversal of 20970090 is 9007902.

It can be written as a sum of positive squares in 2 ways, for example, as 20007729 + 962361 = 4473^2 + 981^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12135 + ... + 13754.

Almost surely, 2^20970090 is an apocalyptic number.

20970090 is an abundant number, since it is smaller than the sum of its proper divisors (35418330).

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

20970090 is a wasteful number, since it uses less digits than its factorization.

20970090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25908 (or 25899 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 20970090 is about 4579.3110835583. The cubic root of 20970090 is about 275.7613721933.

Adding to 20970090 its reverse (9007902), we get a palindrome (29977992).

The spelling of 20970090 in words is "twenty million, nine hundred seventy thousand, ninety".