20551974 has 16 divisors (see below), whose sum is σ = 41195520. Its totient is φ = 6835400.

The previous prime is 20551961. The next prime is 20551987. The reversal of 20551974 is 47915502.

20551974 = 738² + 739² + ... + 773².

It is an interprime number because it is at equal distance from previous prime (20551961) and next prime (20551987).

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, 702 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (2574720).

Almost surely, 2^20551974 is an apocalyptic number.

20551974 is an abundant number, since it is smaller than the sum of its proper divisors (20643546).

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

20551974 is a wasteful number, since it uses less digits than its factorization.

20551974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7635.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20551974 is about 4533.4285039030. The cubic root of 20551974 is about 273.9162814542.

The spelling of 20551974 in words is "twenty million, five hundred fifty-one thousand, nine hundred seventy-four".