20722655 has 16 divisors (see below), whose sum is σ = 26072064. Its totient is φ = 15781920.

The previous prime is 20722649. The next prime is 20722661. The reversal of 20722655 is 55622702.

It is an interprime number because it is at equal distance from previous prime (20722649) and next prime (20722661).

It is not a de Polignac number, because 20722655 - 2⁶ = 20722591 is a prime.

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, 41960 + ... + 42450.

It is an arithmetic number, because the mean of its divisors is an integer number (1629504).

Almost surely, 2^20722655 is an apocalyptic number.

20722655 is a deficient number, since it is larger than the sum of its proper divisors (5349409).

20722655 is a wasteful number, since it uses less digits than its factorization.

20722655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20722655 is about 4552.2142963617. The cubic root of 20722655 is about 274.6724695638.

The spelling of 20722655 in words is "twenty million, seven hundred twenty-two thousand, six hundred fifty-five".