20645702 has 32 divisors (see below), whose sum is σ = 39121920. Its totient is φ = 7937280.

The previous prime is 20645683. The next prime is 20645707. The reversal of 20645702 is 20754602.

It is a super-2 number, since 2×20645702² = 852490022145608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645707) 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, 11318 + ... + 13014.

It is an arithmetic number, because the mean of its divisors is an integer number (1222560).

Almost surely, 2^20645702 is an apocalyptic number.

20645702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20645702 is a deficient number, since it is larger than the sum of its proper divisors (18476218).

20645702 is a wasteful number, since it uses less digits than its factorization.

20645702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20645702 is about 4543.7541746886. The cubic root of 20645702 is about 274.3320516590.

Subtracting 20645702 from its reverse (20754602), we obtain a square (108900 = 330²).

The spelling of 20645702 in words is "twenty million, six hundred forty-five thousand, seven hundred two".