20642710 has 16 divisors (see below), whose sum is σ = 40534992. Its totient is φ = 7506400.

The previous prime is 20642689. The next prime is 20642731. The reversal of 20642710 is 1724602.

It is an interprime number because it is at equal distance from previous prime (20642689) and next prime (20642731).

It is a super-2 number, since 2×20642710² = 852242952288200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 93721 + ... + 93940.

It is an arithmetic number, because the mean of its divisors is an integer number (2533437).

Almost surely, 2^20642710 is an apocalyptic number.

20642710 is a deficient number, since it is larger than the sum of its proper divisors (19892282).

20642710 is a wasteful number, since it uses less digits than its factorization.

20642710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187679.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20642710 is about 4543.4249195953. The cubic root of 20642710 is about 274.3187988417.

It can be divided in two parts, 2064 and 2710, that added together give a palindrome (4774).

The spelling of 20642710 in words is "twenty million, six hundred forty-two thousand, seven hundred ten".