20070640 has 40 divisors (see below), whose sum is σ = 48175488. Its totient is φ = 7768320.

The previous prime is 20070601. The next prime is 20070691. The reversal of 20070640 is 4607002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 1567 + ... + 6526.

Almost surely, 2^20070640 is an apocalyptic number.

20070640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20070640 is an abundant number, since it is smaller than the sum of its proper divisors (28104848).

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

20070640 is a wasteful number, since it uses less digits than its factorization.

20070640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8137 (or 8131 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20070640 is about 4480.0267856342. The cubic root of 20070640 is about 271.7609635809.

Adding to 20070640 its reverse (4607002), we get a palindrome (24677642).

The spelling of 20070640 in words is "twenty million, seventy thousand, six hundred forty".